i known the difference between "dfs_query_then_fetch" and "query_then_fetch",I think this will return different idf ,but it return the same idf and same score,why is it？

I guess it can happen: with 1 shard for the day index when hitting 1 shard (routing) with "luck" on a sample index with only one document Anyway, may be paste your queries and the result? explain option might tell you as well.

"dfs_query_then_fetch" and "query_then_fetch" return the same score

Elastic Stack Elasticsearch

hubo3085632 (Hubo3085632) January 16, 2018, 7:49am 3

thanks a lot ,i find all docs which has the term is on the same shard

Topic		Replies	Views
Per Shard Statistics Elasticsearch	4	1187	July 6, 2017
Why does IDF differs on hits with same query? Elasticsearch	4	1412	July 5, 2017
Dfs_query_then_fetch returns the same scores as query_then_fetch Elasticsearch	3	596	June 22, 2021
How dfs_query_then_fetch works? Elasticsearch	6	2933	February 9, 2018
inconsistent document scores using search_type=dfs_query_then_fetch (how do the _score and _explanation.value fields relate?) Elasticsearch	8	865	December 16, 2011

"dfs_query_then_fetch" and "query_then_fetch" return the same score

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