[Feature Request] Support special characters in elasticsearch credentials

[tluimes]

Support Special Characters in Elasticsearch Credentials

Some special characters are not supported for elasticsearch credentials, as they're not supported by the curl command used by init containers when unquoted.

ex:

until curl --silent --fail --user temporal:T(e-Pa$$word https://elasticsearch-cluster:443/temporal_visibility_v1 2>&1 > /dev/null; do echo waiting for elasticsearch index to become ready; sleep 1; done;
sh: syntax error: unexpected "(" (expecting "do")

Describe the solution you'd like

• Add quotes around password and username to allow the use of special characters.
• Ideally an environment variable would be used for the credentials to prevent displaying credentials when running kubectl describe pod

Additional context

[robholland]

Fixed in #522