Investigate if msearch is a possibility instead of doing two queries

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Background

Querying two indices to support searching issues and the related notes is done by doing two separate calls to each index.

Proposal

Investigate if _msearch could be used to reduce the number of ES calls

https://github.com/elastic/elasticsearch-ruby/blob/555873e78631998bfc021c254f869d2345ef2a75/elasticsearch-api/lib/elasticsearch/api/actions/msearch.rb#L63