Aggregate field with text type

i have two field in kibana "hostname" and "usage", when i add "usage" it will show area chart but when i add "hostname" as breakdown not show.

FYI1: hostname type are text and not aggregatable!
FYI2: these field created by logstash(http_poller) from influxdb.

Any idea?

Can you show the mapping for the index?

From Kibana - Dev Tools

GET indexname

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