How to get specific fields in Elastic Workplace search from Jira Service Management ?

[Fiza Beg]

I looked into forum whether there is any question related to this but couldn't find anyone.

I have integrated JSM with elastic enterprise search (Workplace search).  Over there in workplace I'm getting issue data with several fields like - Priority, created_at, updated_at etc., but some fields are not coming. There are many fields like SLA, severity, time-tracking etc. which are not coming into data being received from Jira. 

I want to start receiving all fields or particular field but couldn't find any way where to make changes and how this connection is working. 

Can anyone help me to know how can I get all fields of the issue data from JSM to Workplace Search.