Check whether a field exists in elasticsearch

I want to draw a timeseries graph in Timelion of Kibana.

For example, below checks for documents which have rating equal to 5.

.es(index='database', timefield='booking_time', q='rating:5')

I want to draw only those documents which have a specific field in it.

In discover tab, I know how to do it, _exists_:field_name.

but I don't know how to do it in Timelion expression.

@sLuvpreet33 the q= parameter in Timelion can be used like the discover tab's query bar, so you can do:

.es(index='database', timefield='booking_time', q='rating:5 AND _exists_:field_name')

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