How to use a variable with ctx['_source'] without tokenising it

Following is my document structure

"ListOfResourcesForTheTeam”:[{"Resource":{"Name": "XYZ", "Phone": 31213}}, { "Resource":{"Name": "ABC", "Phone": 4365}}]

Using update_by_query using painless scripting I am trying to update the phone number of the second resource as following:

docFieldPath = ListOfResourcesForTheTeam.1.Resource


The script errors out as it tries to find “docFieldPath”.

But the following works:


Is there a way in painless script such that I can directly use docFieldPath instead of tokenising it.

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