Flatten json with level limit

[hengfeiyang]

Which OpenObserve functionalities are relevant/related to the feature request?

No response

Description

Now we flatten everything, but in some case the field will become very long: like this:

log_event_context_name_ba_cookie_name_duration: "30"

We can add a limit for flatten, default we only flatten 3 level then the over level will become json string. also we can let user configure the level.

ZO_INGEST_FLATTEN_LEVEL=3

Proposed solution

Alternatives considered