Elastic search and kibana

As we know elasticsearch stores, search and analyses data and then show it on kibana , But i ahve my data is already stored in postgresql and we have to deal with huge data then storing it in elasticsearch for seeing graph on kibana is not good . there will be duplicacy like we have same data in postgres as well as in elasticsearch and i have huge data(full traffic from a telecom company) and we want to build a reporting tool . Kibana has all the features that we want but we dont want this duplicacy of data ... i mean we want to use only Kibana. Is it possible? and what should i do to avoid this problem ?? what are the possibilities??

Kibana cannot connect to a PostgreSQL backend. So your only option is to duplicate the content in elasticsearch.