replica_fix_concurently_index.diff

diff --git a/src/backend/commands/indexcmds.c 
b/src/backend/commands/indexcmds.c
index 13b04e6..1024603 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -881,6 +881,12 @@ DefineIndex(Oid relationId,
      CacheInvalidateRelcacheByRelid(heaprelid.relId);

      /*
+     * Force WAL commit record to ensure that replica receives invalidation
+     * messages.
+     */
+    GetCurrentTransactionId();
+
+    /*
       * Last thing to do is release the session-level lock on the 
parent table.
       */
      UnlockRelationIdForSession(&heaprelid, ShareUpdateExclusiveLock);