Extract hits either as number or structured object #612
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With this commit we add the ability to extract metadata about the hit
count of a search request regardless whether Elasticsearch returns it as
a number (versions before ES 7.0) or as a structured object (as of ES
7.0). We also introduce a new metadata field
hits_relation
whichindicates whether the hit count by Elasticsearch is accurate or an
indication of a lower bound.
Relates elastic/elasticsearch#35849
Closes #611