How can move Elasticsearch index data to RDBMS

In order to join two indexes, i use spark-elasticsearch.

However, this connecter takes so long time to join data.

ex) A: 1,000,000 docs join B:500,000
makes 200,000 docs but it takes to long time. (2 hours)

So i decided to save elasticsearch documents to RDBMS.

Could you recommend the method to save data from elasticsearch to rdbms?

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