Added an ability to override the collaboration feature flag via an environment variable.

provider/indexer-aws/src/main/resources/application.properties

@@ -88,4 +88,4 @@ featureFlag.strategy=appProperty
 featureFlag.asIngestedCoordinates.enabled=true
 featureFlag.keywordLower.enabled=true
 featureFlag.bagOfWords.enabled=true
-collaborations-enabled=true
+collaborations-enabled=${COLLABORATION_FF_ENABLED:true}