libbeats seems to map *big.Int types to strings when publishing - is there any way I can force this to a numeric type by using _meta/fields.yml configuration ?
Yes, in principle you should be able to define it as a
_meta/fields.yml. Did you try that?
I have found that with recent versions of libbeat this file is being ignored (#8397), if this is your case, try to move
_meta/fields.common.yml and run
make update, then setup your index templates again.
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