Install ml-plugins dependency

Signed-off-by: Owais Kazi <[email protected]>

build.gradle

@@ -134,6 +134,7 @@ dependencies {
     implementation "org.opensearch:opensearch:${opensearch_version}"
     implementation 'org.junit.jupiter:junit-jupiter:5.10.0'
     implementation "com.google.guava:guava:32.1.3-jre"
+    zipArchive group: 'org.opensearch.plugin', name:'opensearch-ml-plugin', version: "${opensearch_build}"
     api group: 'org.opensearch', name:'opensearch-ml-client', version: "${opensearch_build}"
 
     configurations.all {