Remove field_stats pre-flight option for index patterns #12814
Merged
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This feature was originally added to make searches against Elasticsearch
more performant when searching across many indices, such as when dealing
with daily indices that have accumulated for years. Elasticsearch now
automatically optimizes index access once a certain amount of shards are
in play, so Kibana doesn't need to hack its own solution.
This option can be removed entirely as existing index patterns that had
this option configured will degrade gracefully.
Closes #12736