Painless scripting - how to compare two different fields present in two different documents of an index

Elastic Stack Elasticsearch
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Hi , I want to compare field 'start_time' present in document 'A' and field 'end_time' present document 'B' and get the result as new field in the document using painless scripting. I am using scripted fields in kibana to achieve this. Did anyone tried this before?

I am using elasticsearch 5.6.4

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Scripting allows generating dynamic values for a single document. There is no way to run a script that operates on multiple documents at the same time.

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@rjernst what would be the best way to do it? appreciate your quick response.

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