Technologies/Elasticsearch/elasticsearch.node.cache.count
ElasticsearchElasticsearchMetric

elasticsearch.node.cache.count

Cache operation count
Dimensions:None
Available on:OpenTelemetryOpenTelemetry (1)

Summary

Reports the number of entries currently held in node-level caches, including query cache and request cache entries. This gauge metric indicates cache occupancy and helps assess cache effectiveness. High entry counts approaching configured limits suggest active caching, while rapid fluctuations indicate cache thrashing (frequent evictions) that degrades performance, as detailed in the "Field Data Cache Eviction Thrash" insight.

Interface Metrics (1)
OpenTelemetryOpenTelemetry
Total count of query cache misses across all shards assigned to selected nodes.
Dimensions:None
Sources
elasticsearch.node.cache.countgithub.com
Related Insights (1)
Field Data Cache Eviction Thrashwarning

Field data (inverted reverse index for aggregations) loads into JVM heap on first access and persists for segment lifetime. When circuit breaker limit or cache size is too small, frequent evictions cause repeated expensive field data loading, spiking CPU and heap pressure.

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