Proper indexing to improve query speed in elasticsearch

I am currently working on an ELK stack where we have a large number of documents (~50k in 1min) coming into our cluster. All the documents are coming from a bunch of log sources with a large number of fields. Currently all the documents go into a single index pattern because of which queries on the data take a long time to respond.
Now, we have identified particular fields(eg: username, IP) in all log sources which are prominently used for querying the data.

  1. I wanted to know how can I properly index the documents (using the above information )so that the response time is improved. (I would like to improve on this part more for our case.)
  2. Also I was thinking of creating different indices for the various log sources which should help in improving the speed.

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