[7.17] Fix missing DRA maven artifacts (elastic#129571)

Author: breskeby

plugins/build.gradle

@@ -14,6 +14,7 @@ subprojects {
 configure(subprojects.findAll { it.parent.path == project.path }) {
   group = 'org.elasticsearch.plugin'
   apply plugin: 'elasticsearch.internal-es-plugin'
+  apply plugin: 'elasticsearch.publish'
 
   esplugin {
     // for local ES plugins, the name of the plugin is the same as the directory