private ExtensionLinkRequest createExtensionLinkRequest(ExtensionLinkEntity entity) {
    if (entity == null) {
      return null;
    }

    return new ExtensionLinkRequest(String.valueOf(entity.getLinkId()),
        entity.getStack().getStackName(),
        entity.getStack().getStackVersion(),
        entity.getExtension().getExtensionName(),
        entity.getExtension().getExtensionVersion());
  }
The property ids for a ExtensionLink resource.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/ExtensionLinkResourceProvider.java