Hello,

I wonder if there is a built-in way to validate data before indexing them. I see two kinds of validation:

* Structural validation of fields based on a regular expression for example. Perhaps something can be configured in the mapping... * Integrity validation of document. For example preventing from indexing a document with a field value that already exists.

In the case where there is no built-in support at the moment, is there a way to extend ElasticSearch to add such processing before indexing using the standard REST calls?

Thanks very much for your help!

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