Set number of replicas and number of shards by helm values

[ftrigari]

Which problem does the PR fix?

#2179

What's in this PR?

With this PR, it is now possible to set numberOfShards and numberOfReplicas directly in the values file. This avoids the need to set these variables manually in environment variables. Additionally, this configuration is included in operate initContainer .

Checklist

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#2179

[CLAassistant]

All committers have signed the CLA.