Builder setEligibleLeaderReplicasEnabled(boolean eligibleLeaderReplicasEnabled) {
            this.eligibleLeaderReplicasEnabled = eligibleLeaderReplicasEnabled;
            return this;
        }
The ReplicationControlManager is the part of the controller which deals with topics
and partitions. It is responsible for managing the in-sync replica set and leader
of each partition, as well as administrative tasks like creating or deleting topics.
metadata/src/main/java/org/apache/kafka/controller/ReplicationControlManager.java