Drop ClusterStateHealth#indices
when unnecessary
#90631
Labels
>bug
:Data Management/Stats
Statistics tracking and retrieval APIs
Team:Data Management
Meta label for data/management team
ClusterStateHealth#indices
might be many MBs of data in a large cluster but it's only used byGET _cat/indices
andGET _cluster/health?level={indices|shards}
so it could reasonably be left empty in all other cases. SimilarlyClusterIndexHealth#shards
is only used byGET _cluster/health?level=shards
and could be omitted elsewhere, giving at least a 2× saving in those cases too.Relates #77466.
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