Custom index user data

Hello all,

Trying to figure out what would be the best way to get the last
modification date from an elasticsearch index.

I can store this data via user data in the Lucene index. The Engine module
should be pluggable, so I can subclass the existing RobinEngine and commit
my own user data, but the issue is returning the values.
IndexStatus/IndexShardStatus are not pluggable, so I would need to create a
whole new request/response family, which is too much work.

Is there a better way to get the last modification date?
If not, would using user data be the best solution? I can create a patch,
but I would hate to see a pull request ignored.



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