Always create search context for scroll queries #52078
Merged
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We need to either exclude null responses from the scroll search response or always create a search context for every target shards, although that scroll query can be written to match_no_docs. Otherwise, we won't find search_context for subsequent scroll requests.
This commit implements the latter option as it's less error-prone.
I labelled this non-issue for an unreleased bug.
Relates #51708