Question about prequery of DFS_Query_then_Fetch

I have a simple question about "prequery" step of "DFS_Query_then_Fetch" search type.
When we create an index of only 1 primary shard and make 4 replicas,
is "prequery" excuted for all 5 shards(primary and replicas) in this case?

Thanks for your help always!

If you only have 1 primary shard you do not need dfs_query_then_fetch as only one of the shards serve each query.

Thanks for your reply.

The situation I wrote was just example.
So, Could I think that "prequery" is excuted for all shards(primary and replicas)?

And is there any problem to get consistent scoring in case of 1 primary shard?
According to the below reference, I just knew that 1 primary shard might also have same issue.

If you only query a single shard your scoring will be consistent. Only a single copy of each shard (primary or replica) is queries so the answer is one.

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.