Elastic Cloud on Kubernetes version 2.6.0

New CRD StackConfigPolicy to declaratively configure multiple Elasticsearch clusters. #6148, #6195
ECK resources Helm chart - Beats. #5899 (issue: #5505)

Expose Kubernetes client QPS as a flag. #6157
Extend existing reattach-pv tool to allow using existing PVs to create newly named cluster. #6118
Add container-suffix operator flag to allow users to specify a container suffix to be applied across all Elastic stack container images. #6086 (issue: #6064)
Elasticsearch observer improvements to avoid blocking between workers. #6084 (issue: #6078)
Improve user password hash comparison performance by utilizing an LRU cache. #6080 (issue: #6076)
Add default securityContext to the manager container in Operator Helm Chart. #6047
Allow Fleet Server to be run without TLS. #6020 (issue: #6000)
Release a FIPS-compliant operator image. #6071

Fix potential panic in Elasticsearch client equal function. #6128
Increment ECK-stack Helm chart version to support addition of Agent/Fleet Server. #6179
Try to reconcile license even in absence of known health status #6278 #6274)

Add experimental label to the StackConfigPolicy doc. #6247
Document Elastic Stack configuration policies. #6215
Update eck-diagnostics documentation for filters. #6191
Add additional Helm documentation for Fleet Server, and Agent. #6154
Update the list of Kibana keys managed by the operator. #6119
Document limitation on Minikube without CNI. #6075
Add latest APM fleet package in Kibana examples when using standalone APM server. #6063 (issue: #5059)