code: public DBCluster withReadReplicaIdentifiers(String... readReplicaIdentifiers) {
          if (this.readReplicaIdentifiers == null) {
              setReadReplicaIdentifiers(new java.util.ArrayList<String>(readReplicaIdentifiers.length));
          }
          for (String ele : readReplicaIdentifiers) {
              this.readReplicaIdentifiers.add(ele);
          }
          return this;
      }
docs: <p>
  Contains one or more identifiers of the Read Replicas associated with this DB cluster.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setReadReplicaIdentifiers(java.util.Collection)} or
  {@link #withReadReplicaIdentifiers(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param readReplicaIdentifiers
  Contains one or more identifiers of the Read Replicas associated with this DB cluster.
  @return Returns a reference to this object so that method calls can be chained together.