How to trigger "indexing.index_failed" stat

One of the stats, that we can receive from the _cat/indices API, is indexing.index_failed.
In the documentation, this stat describes as: "Number of failed indexing operations".
How can I trigger this stat?
I try to do this with incorrect document indexing.
For example, I send a document with an integer in date mapped field, that looks like a classic failed indexing operation, but I do not see any changes in the stat.

Thank a lot!

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