I'm doing search through postman to search against https://DomainName:8089/services/search/jobs/export
I do a POST call with this payload search=search%20index%3DINDEXNAME%20QUERY
It is working fine but I have two issues:
1) time frame: search=search%20index%3DINDEXNAME%20index_earliest =-2d%20index_latest =now%20QUERY
2) outputmode json: search=search%20index%3DINDEXNAME%20index_earliest =-2d%20index_latest =now%20output_mode=json%20QUERY
outputmode xml: search=search%20index%3DINDEXNAME%20index_earliest =-2d%20index_latest =now%20output_mode=xml%20QUERY
by default results will be xml
check below link,
http://docs.splunk.com/Documentation/Splunk/7.0.1/RESTREF/RESTsearch#search.2Fjobs.2Fexport
i hope this helps