The splunk_hec source’s host_field option has been renamed to host_key

This change ensures that the host_key option is consistent across all sources

We’ve renamed the [splunk_hec source’s] host_field option to host_key. This ensures that the host_key option is consistent across all sources.

Upgrade Guide

 [sources.splunk]
   type = "splunk_hec"
-  host_field = "host"
+  host_key = "host"