Document elasticsearch maxConcurrentShardRequests parameter (#39624)
Document elasticsearch maxConcurrentShardRequests parameter (#39624)

* Better elastic documentation.

* apply docs suggestion

Co-authored-by: Elfo404 <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@giordanoricci.com>
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana