[Feature]: Add an optional list of readIndexPrefix for es rollover init to support reading from multiple indices

Requirement

This is preliminary work to allow having multiple read aliases on a single template, to allow split of the write index and still have a common read alias which can read from all indexes

Problem

Currently, we have only one read alias per template which limits if we want to have multiple read alias based of specific use cases, when we have multiple indexes data is being written to.

Proposal

Currently, apart from the default index read alias, allow optionally attaching more read alias to the template

Open questions

No response