Prefix Elasticsearch/ Opensearch indices

[hisImminence]

Give a configuration example for ES and OS prefix configuration in the HCs.

Update this guide for ES: https://docs.camunda.io/docs/next/self-managed/installation-methods/helm/configure/database/elasticsearch/prefix-elasticsearch-indices/

Add the configuration to OS here: https://docs.camunda.io/docs/next/self-managed/installation-methods/helm/configure/database/using-existing-opensearch/

[hisImminence]

Related: #4382

[eamonnmoloney]

Yes, this needs done. The docs are out of date

https://docs.camunda.io/docs/self-managed/deployment/helm/configure/database/elasticsearch/prefix-elasticsearch-indices/?featured=envVars

The docs reference taslist and operate in 8.8... clearly not updated for 8.8