If you are using COMMONAPACHELOG or COMBINEDAPACHELOG in your logstash 
config and 
you've not changed default type for "bytes" it was probably imported into 
elasticsearch as string instead of int

Elasticsearch cannot aggregate this data in such form. 

You'd can either modify "grok-patterns" file for your variable so bytes 
look like below or use mutate function in logstash to convert it to int


(?:%{NUMBER:bytes:int}|-)


regards
m


On Tuesday, 3 February 2015 16:31:12 UTC, Marcello A wrote:
>
> Hi All,
> I'm trying to graph the usage of bandwidth fetched by Apache logs but 
> Kibana histogram doesn't graph any data. Could someone help me to use 
> correctly the histogram panel?
>
> Thanks,
> Marcello
>

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