Clarify function_score default match_all behavior - #12720
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Document that omitting query defaults to match_all, that function filters affect scoring not inclusion, and why unmatched docs score 1. Signed-off-by: MdTanwer <tanw9004167@gmail.com>
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Summary
queryinfunction_scoredefaults tomatch_allwith a base score of1filters affect scoring, not document inclusion_score: 1with default settingsboolquery workaround for filtering by function filtersResolves documentation gap identified in opensearch-project/OpenSearch#21172.