Add index term for backup manifest in documentation.

MasaoFujii · MasaoFujii · commit 4db819ba4039 · 2020-04-17T18:37:38.000+09:00
Author: Fujii Masao Reviewed-by: Robert Haas Discussion: https://postgr.es/m/951743d0-fd7e-8e2b-d489-1368a58b7304@oss.nttdata.com
diff --git a/doc/src/sgml/backup-manifest.sgml b/doc/src/sgml/backup-manifest.sgml
@@ -3,6 +3,10 @@
 <chapter id="backup-manifest-format">
  <title>Backup Manifest Format</title>
 
+  <indexterm>
+   <primary>Backup Manifest</primary>
+  </indexterm>
+
   <para>
    The backup manifest generated by <xref linkend="app-pgbasebackup" /> is
    primarily intended to permit the backup to be verified using
