How do I get a complete list of ALL my indexers created in Splunk Ent. Please see my SPL. It only lists the main indexes.
| tstats count where index=* by splunk_server | fields - count
You can run below on a search head to see all of your indexers with some details.
| rest splunk_server=local /services/search/distributed/peers
| table cluster_label peerName host host_fqdn cpu_arch numberOfCores numberOfVirtualCores physicalMemoryMB os_name os_version version status startup_time | convert ctime(*time)
The Monitoring Console and Cluster Manager both should have a full list of indexers, with the CM likely to be more accurate. The Inherited Development manual (https://docs.splunk.com/Documentation/Splunk/8.1.3/InheritedDeployment/Introduction) offers other suggestions for finding what instances you have.