How can I make a join between two file?

I have two files: us_data_flights and us_states_geo_coordinates.

a) In the file us_data_flights there are data about flights in 2015 with information about departure/arrival state, air_time, delay etc...
b) In the file us states_geo_coordinates there are geo-coordinates for every state.

I would like to generate a Map with delay metrics with kibana.
How can I make a join between field 'state' of file a) and field 'state" of file b) in order to extract coordinates to plot on map?
Thank you very much at all!

You cannot, you need to enrich the data during indexing.

Thank you for your answer. Could you suggest me how can I join the two file using Logstash?
Thank you!

Your problem sounds like you should first denormalize your data before it reaches Elasticsearch. Here are a few pointers to deal with relational data in ES:

Hope this helps,

Thank you very much for your help! Isabel!

Look at the translate filter.

Thank you very much warkolm! Translate filter is great!
But now I have another problem....