[6.x] Add explicit format parameter to docvalue_fields requests (#22771) #22837
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…2771) Fixes elastic#22484 Elasticsearch 6.4 added an optional `format` parameter for doc_value fields. In 6.x if the param is not included it defaults to returning the same values we see in scripted fields. In 7.0 this is changing to use the mapping configured format by default. In kibana we want our date values in ISO format, so this PR future proofs us for 7.0. It also eliminates deprecation warnings ES is returning due to the missing param, which is currently spamming some users.
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Fixes #22484
Elasticsearch 6.4 added an optional
formatparameter for doc_valuefields. In 6.x if the param is not included it defaults to returning
the same values we see in scripted fields. In 7.0 this is changing to
use the mapping configured format by default. In kibana we want our date
values in ISO format, so this PR future proofs us for 7.0. It also eliminates
deprecation warnings ES is returning due to the missing param, which is
currently spamming some users.