Mapper_exception while using runtime dynamic mapping


We are using runtime dynamic mapping for indices and receiving below error while indexing.

Indexing failed for some events, type: mapper_exception, reason: timed out while waiting for a dynamic mapping update

Events have some default keys required by the system, however, events can also contain number of custom arbitrary keys added by users. Required keys are listed in the mapping directly, other keys are mapped in the runtime manner.

I can not find any errors within elasticsearch cluster logs. Any idea why this may be happening? Or what are some of the checks we can do to see why this is happening?

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