@GET
  @Path("{clusterName}")
  @Produces(MediaType.TEXT_PLAIN)
  @ApiOperation(value = "Returns information about a specific cluster", response = ClusterResponseWrapper.class)
  @ApiImplicitParams({
    @ApiImplicitParam(name = QUERY_FIELDS, value = QUERY_FILTER_DESCRIPTION, dataType = DATA_TYPE_STRING, paramType = PARAM_TYPE_QUERY,
      defaultValue = ClusterResourceProvider.ALL_PROPERTIES),
  })
  @ApiResponses({
    @ApiResponse(code = HttpStatus.SC_OK, message = MSG_SUCCESSFUL_OPERATION),
    @ApiResponse(code = HttpStatus.SC_NOT_FOUND, message = MSG_RESOURCE_NOT_FOUND),
    @ApiResponse(code = HttpStatus.SC_UNAUTHORIZED, message = MSG_NOT_AUTHENTICATED),
    @ApiResponse(code = HttpStatus.SC_FORBIDDEN, message = MSG_PERMISSION_DENIED),
    @ApiResponse(code = HttpStatus.SC_INTERNAL_SERVER_ERROR, message = MSG_SERVER_ERROR),
  })
  public Response getCluster(String body, @Context HttpHeaders headers, @Context UriInfo ui,
    @ApiParam(required = true) @PathParam("clusterName") String clusterName
  ) {
    ResourceInstance resource = createClusterResource(clusterName);
    return handleRequest(headers, body, ui, Request.Type.GET, resource);
  }
Handles: GET /clusters/{clusterID}
Get a specific cluster.

@param headers      http headers
@param ui           uri info
@param clusterName  cluster id

@return cluster instance representation
ambari-server/src/main/java/org/apache/ambari/server/api/services/ClusterService.java