splunk_hec Driver Fails Syntax Check (4232695)

When using the splunk_hec() driver it fails to pass the syntax check and Syslog-ng PE cannot start with the following error:

Error parsing destination statement, destination plugin splunk_hec not found in /opt/syslog-ng/etc/syslog-ng.conf:36:2-36:12:

35      destination d_splunk_hec {
36---->         splunk_hec(
36---->         ^^^^^^^^^^
37                      url("http://example.server.com:8088/services/collector/event")
38                      index("ExampleIndex")
39                      token("17a271a3-fba4-412a-8b40-1ac9b31c18ea")
40              );
41      };

Ensure the scl.conf configuration file is present in the following location:

/opt/syslog-ng/etc/scl.conf

Ensure the following is included within the syslog-ng.conf configuration file:

@include "scl.conf"