in beat.hostname, some are in CAPS / small , lower /upper case characters .
To stabilize the search, i want to extract server name without fqdn and store in new field in lower case i tried following
If the field name contains a period you would refer to it as beat.hostname. If the beat field is an object that contains a Hostname field then you would refer to it as [beat][Hostname]. I suspect you need to update your split option.
I am able to do this via workaround
copy nesting field to temp field
add field host1 > beat.hostname
split field host1 , "."
add_field shhost > host1[0]
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