yes, but still a splunk instance
here are some links from answers regarding same question:
https://answers.splunk.com/answers/399162/how-to-install-multiple-instances-of-splunk-64-on.html
and community:
https://wiki.splunk.com/Community:Run_multiple_Splunks_on_one_machine
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Yes, use the below endpoint to get the list of indexers from any search head -
| rest /servicesNS/-/-/search/distributed/peers splunk_server=local | table title host_fqdn
OR
curl -s -k -u admin:password https://<search_head>:8089/servicesNS/-/-/search/distributed/peers
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