From b057c516f2eeeba76094d0de7ec0857136eb2f81 Mon Sep 17 00:00:00 2001
From: Jonathan Healy <jonathan.d.healy@gmail.com>
Date: Sun, 22 Jun 2025 14:59:59 +0800
Subject: [PATCH 1/5] Update README.md, stac-fastapi badge to 6.0.0

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 11619f86..8ab49c4e 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
   [![GitHub forks](https://img.shields.io/github/forks/stac-utils/stac-fastapi-elasticsearch-opensearch.svg?color=blue)](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/network/members)
    [![PyPI version](https://img.shields.io/pypi/v/stac-fastapi-elasticsearch.svg?color=blue)](https://pypi.org/project/stac-fastapi-elasticsearch/)
   [![STAC](https://img.shields.io/badge/STAC-1.1.0-blue.svg)](https://github.com/radiantearth/stac-spec/tree/v1.1.0)
-  [![stac-fastapi](https://img.shields.io/badge/stac--fastapi-5.2.0-blue.svg)](https://github.com/stac-utils/stac-fastapi)
+  [![stac-fastapi](https://img.shields.io/badge/stac--fastapi-6.0.0-blue.svg)](https://github.com/stac-utils/stac-fastapi)
 
 ## Sponsors & Supporters
 

From a0b77cbecd7be115d94a4bdd38c3a7eb5dad26b8 Mon Sep 17 00:00:00 2001
From: z-mrozu <43796046+z-mrozu@users.noreply.github.com>
Date: Wed, 2 Jul 2025 08:24:11 +0200
Subject: [PATCH 2/5] Timeout setting for Opensearch and Elasticsearch (#408)

**Description:**

Added timeout setting in Opensearch & Elasticsearch config which should
only be relevant if user sets "ES_TIMEOUT"

**PR Checklist:**

- [x] Code is formatted and linted (run `pre-commit run --all-files`)
- [x] Tests pass (run `make test`)
- [x] Documentation has been updated to reflect changes, if applicable
- [x] Changes are added to the changelog
---
 CHANGELOG.md                                    |  4 ++++
 README.md                                       | 17 +++++++++--------
 .../stac_fastapi/elasticsearch/config.py        |  4 ++++
 .../stac_fastapi/opensearch/config.py           |  4 ++++
 4 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 979094a4..421e8315 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Added
+
+- Added the ability to set timeout for Opensearch and Elasticsearch clients by setting the environmental variable `ES_TIMEOUT` [#408](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/408)
+
 ## [v6.0.0] - 2025-06-22
 
 ### Added
diff --git a/README.md b/README.md
index 8ab49c4e..4d2cb807 100644
--- a/README.md
+++ b/README.md
@@ -207,26 +207,27 @@ You can customize additional settings in your `.env` file:
 | `ES_PORT`                    | Port for Elasticsearch/OpenSearch.                                                   | `9200` (ES) / `9202` (OS)| Optional                                                                                    |
 | `ES_USE_SSL`                 | Use SSL for connecting to Elasticsearch/OpenSearch.                                  | `false`                  | Optional                                                                                    |
 | `ES_VERIFY_CERTS`            | Verify SSL certificates when connecting.                                             | `false`                  | Optional                                                                                    |
+| `ES_TIMEOUT`                 | Client timeout for Elasticsearch/OpenSearch.                                         | DB client default        | Optional                                                                                    |
 | `STAC_FASTAPI_TITLE`         | Title of the API in the documentation.                                               | `stac-fastapi-<backend>` | Optional                                                                                    |
 | `STAC_FASTAPI_DESCRIPTION`   | Description of the API in the documentation.                                         | N/A                      | Optional                                                                                    |
 | `STAC_FASTAPI_VERSION`       | API version.                                                                         | `2.1`                    | Optional                                                                                    |
-| `STAC_FASTAPI_LANDING_PAGE_ID` | Landing page ID                                                                      | `stac-fastapi`           | Optional                                                                                    |
+| `STAC_FASTAPI_LANDING_PAGE_ID` | Landing page ID                                                                    | `stac-fastapi`           | Optional                                                                                    |
 | `APP_HOST`                   | Server bind address.                                                                 | `0.0.0.0`                | Optional                                                                                    |
 | `APP_PORT`                   | Server port.                                                                         | `8080`                   | Optional                                                                                    |
 | `ENVIRONMENT`                | Runtime environment.                                                                 | `local`                  | Optional                                                                                    |
 | `WEB_CONCURRENCY`            | Number of worker processes.                                                          | `10`                     | Optional                                                                                    |
 | `RELOAD`                     | Enable auto-reload for development.                                                  | `true`                   | Optional                                                                                    |
 | `STAC_FASTAPI_RATE_LIMIT`    | API rate limit per client.                                                           | `200/minute`             | Optional                                                                                    |
-| `BACKEND`                    | Tests-related variable                                                               | `elasticsearch` or `opensearch` based on the backend | Optional                                                                                    |
-| `ELASTICSEARCH_VERSION`          | Version of Elasticsearch to use.                                                         | `8.11.0`                      | Optional                                                                                    |                                                                             |
-| `OPENSEARCH_VERSION`         | OpenSearch version                                                                   | `2.11.1`                 | Optional       
-| `ENABLE_DIRECT_RESPONSE`         | Enable direct response for maximum performance (disables all FastAPI dependencies, including authentication, custom status codes, and validation) | `false`                  | Optional       
-| `RAISE_ON_BULK_ERROR`         | Controls whether bulk insert operations raise exceptions on errors. If set to `true`, the operation will stop and raise an exception when an error occurs. If set to `false`, errors will be logged, and the operation will continue. **Note:** STAC Item and ItemCollection validation errors will always raise, regardless of this flag. | `false`             Optional                                                                                |
-| `DATABASE_REFRESH`              | Controls whether database operations refresh the index immediately after changes. If set to `true`, changes will be immediately searchable. If set to `false`, changes may not be immediately visible but can improve performance for bulk operations. If set to `wait_for`, changes will wait for the next refresh cycle to become visible. | `false`                  | Optional |
+| `BACKEND`                    | Tests-related variable                                                               | `elasticsearch` or `opensearch` based on the backend | Optional                                                        |
+| `ELASTICSEARCH_VERSION`      | Version of Elasticsearch to use.                                                     | `8.11.0`                 | Optional                                                                                    |
+| `OPENSEARCH_VERSION`         | OpenSearch version                                                                   | `2.11.1`                 | Optional                                                                                    |
+| `ENABLE_DIRECT_RESPONSE`     | Enable direct response for maximum performance (disables all FastAPI dependencies, including authentication, custom status codes, and validation) | `false`                  | Optional                       |
+| `RAISE_ON_BULK_ERROR`        | Controls whether bulk insert operations raise exceptions on errors. If set to `true`, the operation will stop and raise an exception when an error occurs. If set to `false`, errors will be logged, and the operation will continue. **Note:** STAC Item and ItemCollection validation errors will always raise, regardless of this flag. | `false` | Optional |
+| `DATABASE_REFRESH`           | Controls whether database operations refresh the index immediately after changes. If set to `true`, changes will be immediately searchable. If set to `false`, changes may not be immediately visible but can improve performance for bulk operations. If set to `wait_for`, changes will wait for the next refresh cycle to become visible. | `false` | Optional |
 | `ENABLE_TRANSACTIONS_EXTENSIONS` | Enables or disables the Transactions and Bulk Transactions API extensions. If set to `false`, the POST `/collections` route and related transaction endpoints (including bulk transaction operations) will be unavailable in the API. This is useful for deployments where mutating the catalog via the API should be prevented. | `true` | Optional |
 
 > [!NOTE]
-> The variables `ES_HOST`, `ES_PORT`, `ES_USE_SSL`, and `ES_VERIFY_CERTS` apply to both Elasticsearch and OpenSearch backends, so there is no need to rename the key names to `OS_` even if you're using OpenSearch.
+> The variables `ES_HOST`, `ES_PORT`, `ES_USE_SSL`, `ES_VERIFY_CERTS` and `ES_TIMEOUT` apply to both Elasticsearch and OpenSearch backends, so there is no need to rename the key names to `OS_` even if you're using OpenSearch.
 
 ## Interacting with the API
 
diff --git a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py
index 49495854..c5b6e3dd 100644
--- a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py
+++ b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py
@@ -56,6 +56,10 @@ def _es_config() -> Dict[str, Any]:
     if (u := os.getenv("ES_USER")) and (p := os.getenv("ES_PASS")):
         config["http_auth"] = (u, p)
 
+    # Include timeout setting if set
+    if request_timeout := os.getenv("ES_TIMEOUT"):
+        config["request_timeout"] = request_timeout
+
     # Explicitly exclude SSL settings when not using SSL
     if not use_ssl:
         return config
diff --git a/stac_fastapi/opensearch/stac_fastapi/opensearch/config.py b/stac_fastapi/opensearch/stac_fastapi/opensearch/config.py
index 3fe4d71b..08e9a42a 100644
--- a/stac_fastapi/opensearch/stac_fastapi/opensearch/config.py
+++ b/stac_fastapi/opensearch/stac_fastapi/opensearch/config.py
@@ -53,6 +53,10 @@ def _es_config() -> Dict[str, Any]:
 
         config["headers"] = headers
 
+    # Include timeout setting if set
+    if timeout := os.getenv("ES_TIMEOUT"):
+        config["timeout"] = timeout
+
     # Explicitly exclude SSL settings when not using SSL
     if not use_ssl:
         return config

From 90fd9caa6dbb3fd549bbb119cdec7bdd5781e90e Mon Sep 17 00:00:00 2001
From: simonvb00 <159138195+simonvb00@users.noreply.github.com>
Date: Sat, 19 Jul 2025 00:13:05 +0200
Subject: [PATCH 3/5] Added support for searching large amount of indices
 (#412)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

**Description:**
When searching the catalog with the `/search`-endpoint, a `GET
/<indices>/_search` request is done with all indices listed in the URL
path. However when doing such a search on a large amount of indices, it
is possible that the size of the endpoint exceeds Elasticsearch’s
maximum allowed HTTP line length (4096 bytes), resulting in the
following error:

`{"code":"RequestError","description":"RequestError(400,
'too_long_http_line_exception', 'An HTTP line is larger than 4096
bytes.')"}`

The solution in this commit moves the indices from the endpoint to the
body of the request once the amount of indices passes a certain
threshold. The indices of the endpoint will be replaced by
`ITEM_INDICES`. Since the query still filters on the correct indices,
this change preserves the behavior while avoiding the URL length
limitation.

**PR Checklist:**

- [x] Code is formatted and linted (run `pre-commit run --all-files`)
- [x] Tests pass (run `make test`)
- [ ] Documentation has been updated to reflect changes, if applicable
- [x] Changes are added to the changelog

---------

Co-authored-by: Stijn Caerts <stijn.caerts@vito.be>
---
 CHANGELOG.md                                  |  4 +++
 .../elasticsearch/database_logic.py           |  7 ++++
 .../stac_fastapi/opensearch/database_logic.py | 12 +++++--
 .../sfeos_helpers/database/query.py           | 32 +++++++++++++++++++
 4 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 421e8315..780386b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - Added the ability to set timeout for Opensearch and Elasticsearch clients by setting the environmental variable `ES_TIMEOUT` [#408](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/408)
 
+### Changed
+
+- Updated collection to index logic to support searching a large amount of indices [#412](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/412)
+
 ## [v6.0.0] - 2025-06-22
 
 ### Added
diff --git a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py
index 195950f3..16a8a83d 100644
--- a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py
+++ b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py
@@ -43,6 +43,10 @@
     return_date,
     validate_refresh,
 )
+from stac_fastapi.sfeos_helpers.database.query import (
+    ES_MAX_URL_LENGTH,
+    add_collections_to_body,
+)
 from stac_fastapi.sfeos_helpers.database.utils import (
     merge_to_operations,
     operations_to_script,
@@ -520,6 +524,9 @@ async def execute_search(
         query = search.query.to_dict() if search.query else None
 
         index_param = indices(collection_ids)
+        if len(index_param) > ES_MAX_URL_LENGTH - 300:
+            index_param = ITEM_INDICES
+            query = add_collections_to_body(collection_ids, query)
 
         max_result_window = MAX_LIMIT
 
diff --git a/stac_fastapi/opensearch/stac_fastapi/opensearch/database_logic.py b/stac_fastapi/opensearch/stac_fastapi/opensearch/database_logic.py
index e4c88d85..c323b307 100644
--- a/stac_fastapi/opensearch/stac_fastapi/opensearch/database_logic.py
+++ b/stac_fastapi/opensearch/stac_fastapi/opensearch/database_logic.py
@@ -42,6 +42,10 @@
     return_date,
     validate_refresh,
 )
+from stac_fastapi.sfeos_helpers.database.query import (
+    ES_MAX_URL_LENGTH,
+    add_collections_to_body,
+)
 from stac_fastapi.sfeos_helpers.database.utils import (
     merge_to_operations,
     operations_to_script,
@@ -532,6 +536,12 @@ async def execute_search(
         """
         search_body: Dict[str, Any] = {}
         query = search.query.to_dict() if search.query else None
+
+        index_param = indices(collection_ids)
+        if len(index_param) > ES_MAX_URL_LENGTH - 300:
+            index_param = ITEM_INDICES
+            query = add_collections_to_body(collection_ids, query)
+
         if query:
             search_body["query"] = query
 
@@ -544,8 +554,6 @@ async def execute_search(
 
         search_body["sort"] = sort if sort else DEFAULT_SORT
 
-        index_param = indices(collection_ids)
-
         max_result_window = MAX_LIMIT
 
         size_limit = min(limit + 1, max_result_window)
diff --git a/stac_fastapi/sfeos_helpers/stac_fastapi/sfeos_helpers/database/query.py b/stac_fastapi/sfeos_helpers/stac_fastapi/sfeos_helpers/database/query.py
index dacbb590..97df5703 100644
--- a/stac_fastapi/sfeos_helpers/stac_fastapi/sfeos_helpers/database/query.py
+++ b/stac_fastapi/sfeos_helpers/stac_fastapi/sfeos_helpers/database/query.py
@@ -7,6 +7,8 @@
 
 from stac_fastapi.sfeos_helpers.mappings import Geometry
 
+ES_MAX_URL_LENGTH = 4096
+
 
 def apply_free_text_filter_shared(
     search: Any, free_text_queries: Optional[List[str]]
@@ -83,3 +85,33 @@ def populate_sort_shared(sortby: List) -> Optional[Dict[str, Dict[str, str]]]:
         return {s.field: {"order": s.direction} for s in sortby}
     else:
         return None
+
+
+def add_collections_to_body(
+    collection_ids: List[str], query: Optional[Dict[str, Any]]
+) -> Dict[str, Any]:
+    """Add a list of collection ids to the body of a query.
+
+    Args:
+        collection_ids (List[str]): A list of collections ids.
+        query (Optional[Dict[str, Any]]): The query to add collections to. If none, create a query that filters
+        the collection ids.
+
+    Returns:
+        Dict[str, Any]: A query that contains a filter on the given collection ids.
+
+    Notes:
+        This function is needed in the execute_search function when the size of the URL path will exceed the maximum of ES.
+    """
+    index_filter = {"terms": {"collection": collection_ids}}
+    if query is None:
+        query = {"query": {}}
+    if "bool" not in query:
+        query["bool"] = {}
+    if "filter" not in query["bool"]:
+        query["bool"]["filter"] = []
+
+    filters = query["bool"]["filter"]
+    if index_filter not in filters:
+        filters.append(index_filter)
+    return query

From 970f65e88c410c4ce01390d78be33cd29dd1f9ec Mon Sep 17 00:00:00 2001
From: Bennett Brixen <bbrixen02@gmail.com>
Date: Sun, 20 Jul 2025 15:00:44 -0600
Subject: [PATCH 4/5] update ES env variable documentation (#410)

fixes incorrect or missing documentation for ES_USE_SSL,
ES_VERIFY_CERTS, and ES_API_KEY


**Description:**
- README.md documentation has incorrect default values for ES_USE_SSL
and ES_VERIFY_CERTS
- The default values that are used can be found at:
`./stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py` and
`./stac_fastapi/opensearch/stac_fastapi/opensearch/config.py`
- Adds documentation for ES_API_KEY

**PR Checklist:**

- [X] Code is formatted and linted (run `pre-commit run --all-files`)
- [X] Tests pass (run `make test`)
- [X] Documentation has been updated to reflect changes, if applicable
- [X] Changes are added to the changelog

---------

Co-authored-by: Bennett Patrick Brixen <bpbrixe@sandia.gov>
Co-authored-by: Jonathan Healy <jonathan.d.healy@gmail.com>
---
 CHANGELOG.md | 2 ++
 README.md    | 7 ++++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 780386b1..c6951ef4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Changed
 
 - Updated collection to index logic to support searching a large amount of indices [#412](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/412)
+- Updated documentation to reflect use of ES environment variables [#410](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/410)
+- Updated documentation to reflect `APP_PORT` in [stac-fastapi-core ApiSettings](https://github.com/stac-utils/stac-fastapi/blob/fa42985255fad0bab7dbe3aadbf1f74cb1635f3a/stac_fastapi/types/stac_fastapi/types/config.py#L30) [#410](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/410)
 
 ## [v6.0.0] - 2025-06-22
 
diff --git a/README.md b/README.md
index 4d2cb807..9e5a4674 100644
--- a/README.md
+++ b/README.md
@@ -205,15 +205,16 @@ You can customize additional settings in your `.env` file:
 |------------------------------|--------------------------------------------------------------------------------------|--------------------------|---------------------------------------------------------------------------------------------|
 | `ES_HOST`                    | Hostname for external Elasticsearch/OpenSearch.                                      | `localhost`              | Optional                                                                                    |
 | `ES_PORT`                    | Port for Elasticsearch/OpenSearch.                                                   | `9200` (ES) / `9202` (OS)| Optional                                                                                    |
-| `ES_USE_SSL`                 | Use SSL for connecting to Elasticsearch/OpenSearch.                                  | `false`                  | Optional                                                                                    |
-| `ES_VERIFY_CERTS`            | Verify SSL certificates when connecting.                                             | `false`                  | Optional                                                                                    |
+| `ES_USE_SSL`                 | Use SSL for connecting to Elasticsearch/OpenSearch.                                  | `true`                   | Optional                                                                                    |
+| `ES_VERIFY_CERTS`            | Verify SSL certificates when connecting.                                             | `true`                   | Optional                                                                                    |
+| `ES_API_KEY`                 | API Key for external Elasticsearch/OpenSearch.                                       | N/A                      | Optional                                                                                    |
 | `ES_TIMEOUT`                 | Client timeout for Elasticsearch/OpenSearch.                                         | DB client default        | Optional                                                                                    |
 | `STAC_FASTAPI_TITLE`         | Title of the API in the documentation.                                               | `stac-fastapi-<backend>` | Optional                                                                                    |
 | `STAC_FASTAPI_DESCRIPTION`   | Description of the API in the documentation.                                         | N/A                      | Optional                                                                                    |
 | `STAC_FASTAPI_VERSION`       | API version.                                                                         | `2.1`                    | Optional                                                                                    |
 | `STAC_FASTAPI_LANDING_PAGE_ID` | Landing page ID                                                                    | `stac-fastapi`           | Optional                                                                                    |
 | `APP_HOST`                   | Server bind address.                                                                 | `0.0.0.0`                | Optional                                                                                    |
-| `APP_PORT`                   | Server port.                                                                         | `8080`                   | Optional                                                                                    |
+| `APP_PORT`                   | Server port.                                                                         | `8000`                   | Optional                                                                                    |
 | `ENVIRONMENT`                | Runtime environment.                                                                 | `local`                  | Optional                                                                                    |
 | `WEB_CONCURRENCY`            | Number of worker processes.                                                          | `10`                     | Optional                                                                                    |
 | `RELOAD`                     | Enable auto-reload for development.                                                  | `true`                   | Optional                                                                                    |

From e34e923ad61e542607be14ab5e52ac8915139819 Mon Sep 17 00:00:00 2001
From: GrzegorzPustulka <94792342+GrzegorzPustulka@users.noreply.github.com>
Date: Mon, 21 Jul 2025 13:01:48 +0200
Subject: [PATCH 5/5] Enable collection filtering support for stac-auth-proxy
 (#411)

Added `collection-search#filter` conformance class to
CollectionSearchExtension to enable compatibility with stac-auth-proxy
collection filtering


**PR Checklist:**

- [ ] Code is formatted and linted (run `pre-commit run --all-files`)
- [ ] Tests pass (run `make test`)
- [ ] Documentation has been updated to reflect changes, if applicable
- [ ] Changes are added to the changelog

---------

Co-authored-by: Grzegorz Pustulka <gpustulka@cloudferro.com>
Co-authored-by: Jonathan Healy <jonathan.d.healy@gmail.com>
Co-authored-by: Bennett Brixen <bbrixen02@gmail.com>
Co-authored-by: Bennett Patrick Brixen <bpbrixe@sandia.gov>
---
 CHANGELOG.md                                           |  1 +
 .../elasticsearch/stac_fastapi/elasticsearch/app.py    | 10 ++++++++++
 stac_fastapi/opensearch/stac_fastapi/opensearch/app.py | 10 ++++++++++
 3 files changed, 21 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c6951ef4..624b0043 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 - Added the ability to set timeout for Opensearch and Elasticsearch clients by setting the environmental variable `ES_TIMEOUT` [#408](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/408)
+- Added `collection-search#filter` conformance class to CollectionSearchExtension to enable compatibility with stac-auth-proxy collection filtering  [#411](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/411)
 
 ### Changed
 
diff --git a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/app.py b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/app.py
index 7e145072..c348822f 100644
--- a/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/app.py
+++ b/stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/app.py
@@ -31,6 +31,7 @@
 )
 from stac_fastapi.extensions.core import (
     AggregationExtension,
+    CollectionSearchExtension,
     FilterExtension,
     FreeTextExtension,
     SortExtension,
@@ -60,6 +61,14 @@
     FilterConformanceClasses.ADVANCED_COMPARISON_OPERATORS
 )
 
+# Adding collection search extension for compatibility with stac-auth-proxy
+# (https://github.com/developmentseed/stac-auth-proxy)
+# The extension is not fully implemented yet but is required for collection filtering support
+collection_search_extension = CollectionSearchExtension()
+collection_search_extension.conformance_classes.append(
+    "https://api.stacspec.org/v1.0.0-rc.1/collection-search#filter"
+)
+
 aggregation_extension = AggregationExtension(
     client=EsAsyncBaseAggregationClient(
         database=database_logic, session=session, settings=settings
@@ -75,6 +84,7 @@
     TokenPaginationExtension(),
     filter_extension,
     FreeTextExtension(),
+    collection_search_extension,
 ]
 
 if TRANSACTIONS_EXTENSIONS:
diff --git a/stac_fastapi/opensearch/stac_fastapi/opensearch/app.py b/stac_fastapi/opensearch/stac_fastapi/opensearch/app.py
index c047014a..b31281fa 100644
--- a/stac_fastapi/opensearch/stac_fastapi/opensearch/app.py
+++ b/stac_fastapi/opensearch/stac_fastapi/opensearch/app.py
@@ -25,6 +25,7 @@
 from stac_fastapi.core.utilities import get_bool_env
 from stac_fastapi.extensions.core import (
     AggregationExtension,
+    CollectionSearchExtension,
     FilterExtension,
     FreeTextExtension,
     SortExtension,
@@ -60,6 +61,14 @@
     FilterConformanceClasses.ADVANCED_COMPARISON_OPERATORS
 )
 
+# Adding collection search extension for compatibility with stac-auth-proxy
+# (https://github.com/developmentseed/stac-auth-proxy)
+# The extension is not fully implemented yet but is required for collection filtering support
+collection_search_extension = CollectionSearchExtension()
+collection_search_extension.conformance_classes.append(
+    "https://api.stacspec.org/v1.0.0-rc.1/collection-search#filter"
+)
+
 aggregation_extension = AggregationExtension(
     client=EsAsyncBaseAggregationClient(
         database=database_logic, session=session, settings=settings
@@ -75,6 +84,7 @@
     TokenPaginationExtension(),
     filter_extension,
     FreeTextExtension(),
+    collection_search_extension,
 ]
 
 

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