Setting default index in Kibana 4
it seems your not the only one having this issue with couchbase => https://github.com/elastic/kibana/issues/3331#issuecomment-84942136
After changing couchbase_template.json it's needed to set
curl -XPUT http://localhost:9200/_template/couchbase -d @/usr/share/elasticsearch/plugins/transport-couchbase/couchbase_template.json
and now it works. Thnx juliendangers for directions.