How to combine existing elasticsearch index with information from database (RDBMS) for doing additional analysis

Hi,

Can some one recommend, How to combine existing elasticsearch index with
information from database (RDBMS) for doing additional analysis.

Description:

Database Table - MySQL I have some data in Database ( userid, location,
useremail)

ElasticSearch Index - In Elasticsearch I have indexed data which has
(Document) ( Userid, Messages Sent)

How can I query these two datastores to get information as

userid,location,useremail,messages Sent

Thanks,

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