Invalid Index Name Exception

[Badger]

@hnf

"reason"=>"Invalid index name [field_reference1,field_reference2]

I suspect you are unconditionally doing both the

add_field => { "indexname" => "field_reference1" }

and

add_field => { "indexname" => "field_reference2" }

for the same events. In that case indexname will be an array and if the logstash calls .to_s to convert that to a string (which the index option has to be) then it will end up with comma separated names, causing elasticsearch to throw that exception.