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