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# Change Document Field Values

The `DREREPLACE` action instructs the DIH to change the values of fields in its child IDOL Server indexed documents.

Note: This action requires a `POST` request method.

Use the following action syntax:

    http://DIHhost:IndexPort/DREREPLACE?Data#DREENDDATA

When you send this action to the DIH instead of to an IDOL Server, note:

- `DIHhost` is the IP address (or name) of the machine on which the DIH is installed, and `IndexPort` is the number of the port that you use to send index actions to the DIH.
- Specify documents only by reference, not by document ID. Because dissimilar documents in different databases can have the same document ID, using document IDs with this action can have unintended consequences.

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