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Elasticsearch v7.0 changed the behavior of max concurrent shard requests and the default to 5. v5.6 and before 7.0 the default is 256. This adds some additional behavior given certain version is selected when configure the datasource to set default max concurrent shard requests. Changing from a version pre-v7.0+ to v7.0+ sets max concurrent shard requests to 5. Changing from a version v7.0+ to a pre-v7.0 sets max concurrent shard requests to 256. Fixes #17454
Elasticsearch Data Source - Native Plugin
Grafana ships with advanced support for Elasticsearch. You can do many types of simple or complex elasticsearch queries to visualize logs or metrics stored in Elasticsearch. You can also annotate your graphs with log events stored in Elasticsearch.
Read more about it here: