PLT-7934: Make query for bulk elasticsearch indexing more efficient. (#7664)

config/default.json

@@ -317,7 +317,8 @@
         "AggregatePostsAfterDays": 365,
         "PostsAggregatorJobStartTime": "03:00",
         "IndexPrefix": "",
-        "LiveIndexingBatchSize": 1
+        "LiveIndexingBatchSize": 1,
+        "BulkIndexingTimeWindowSeconds": 3600
     },
     "DataRetentionSettings": {
         "EnableMessageDeletion": false,