code: public void setRetentionConfigurationNames(java.util.Collection<String> retentionConfigurationNames) {
          if (retentionConfigurationNames == null) {
              this.retentionConfigurationNames = null;
              return;
          }
  
          this.retentionConfigurationNames = new com.amazonaws.internal.SdkInternalList<String>(retentionConfigurationNames);
      }
docs: <p>
  A list of names of retention configurations for which you want details. If you do not specify a name, AWS Config
  returns details for all the retention configurations for that account.
  </p>
  <note>
  <p>
  Currently, AWS Config supports only one retention configuration per region in your account.
  </p>
  </note>
  
  @param retentionConfigurationNames
  A list of names of retention configurations for which you want details. If you do not specify a name, AWS
  Config returns details for all the retention configurations for that account.</p> <note>
  <p>
  Currently, AWS Config supports only one retention configuration per region in your account.
  </p>