Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/970
> @justinleet Solve the code reuse problem for Solr and ES.
I am also noticing another positive side effect here. Getting rid of these
interface hierarchies (like having the `MetaAlertService` use an
`MetaAlertUpdateDao`) is that the service layer becomes where code lives that
can be reused across ES and Solr. And that makes a ton of logical sense to me.
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