Dynamically append field from an index to same field in other indices

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Hi,

I would like to achieve the following:
Lets say there are 3 indices A, B & C, each having a document with _id '1'.

I would like to append value of a field in A to the same field in indices B & C, where document _id is 1 for all.

Similarly, this has to be done for all documents that match a criteria- append a field's value from A to the same field in other indices with matching document _ids.

What's the best way to achieve this?

Thanks!

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