/*
$params['fields']        = (list) A comma-separated list of fields for `fielddata` metric (supports wildcards)
       ['metric_family'] = (enum) Limit the information returned to a certain metric family
       ['metric']        = (enum) Limit the information returned for `indices` family to a specific metric
       ['node_id']       = (list) A comma-separated list of node IDs or names to limit the returned information; use `_local` to return information from the node you're connecting to, leave empty to get information from all nodes
       ['all']           = (boolean) Return all available information
       ['clear']         = (boolean) Reset the default level of detail
       ['fs']            = (boolean) Return information about the filesystem
       ['http']          = (boolean) Return information about HTTP
       ['indices']       = (boolean) Return information about indices
       ['jvm']           = (boolean) Return information about the JVM
       ['network']       = (boolean) Return information about network
       ['os']            = (boolean) Return information about the operating system
       ['process']       = (boolean) Return information about the Elasticsearch process
       ['thread_pool']   = (boolean) Return information about the thread pool
       ['transport']     = (boolean) Return information about transport
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->nodes()->stats($params);

/*
$params['node_id']       = (list) A comma-separated list of node IDs or names to limit the returned information; use `_local` to return information from the node you're connecting to, leave empty to get information from all nodes
       ['metric']        = (list) A comma-separated list of metrics you wish returned. Leave empty to return all.
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->nodes()->info($params);

/*
$params['node_id']   = (list) A comma-separated list of node IDs or names to limit the returned information; use `_local` to return information from the node you're connecting to, leave empty to get information from all nodes
       ['interval']  = (time) The interval for the second sampling of threads
       ['snapshots'] = (number) Number of samples of thread stacktrace (default: 10)
       ['threads']   = (number) Specify the number of threads to provide information for (default: 3)
       ['type']      = (enum) The type to sample (default: cpu)
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->nodes()->hotThreads($params);

/*
$params['node_id'] = (list) A comma-separated list of node IDs or names to perform the operation on; use `_local` to perform the operation on the node you're connected to, leave empty to perform the operation on all nodes
       ['delay']   = (time) Set the delay for the operation (default: 1s)
       ['exit']    = (boolean) Exit the JVM as well (default: true)
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->nodes()->shutdown($params);