Nhat Nguyen 9f541d909d Always create search context for scroll queries (#52078)
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.

Relates #51708
2020-02-08 13:01:01 -05:00
..