Merging documents in elasticsearch

Hi All,
We are pulling data from servicenow using logstash http poller. The rest api which I am using has a field call location, which is a location name(chennai, India) I doesnot have latitude and longitude field.

We got to know servicenow maintains location information in a different we have ingested data from that table into elasticsearch now I have two index
one without latitude and longitude information.
Two with latitude and longitude information

Now my question is how do I merge these two index to get the lat & long and create map visualization.

Or is there any other way to get the lat & long get attached with the document.
Any advice please


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