Support Index `aliases` in Opensearch as a data source.

[Utkarsh-Aga]

Is your feature request related to a problem? Please describe. Currently, opensearch as a source supports indices but not aliases.

Describe the solution you'd like Support aliases as well

Describe alternatives you've considered (Optional) index_name_regex is supported so one can provide the regex pattern, but in case if there are changes in the name of the indices, the user has to modify the index_name_regex accordingly. With support of aliases one can change the indexes an alias points to at any time without modifying the configuration.

[Utkarsh-Aga]

If the team, is ok to have this feature. I would be more than happy to work on this.