/*
$params['index']                      = (string) Limit the information returned to a specific index
       ['level']                      = (enum) Specify the level of detail for returned information
       ['local']                      = (boolean) Return local information, do not retrieve the state from master node (default: false)
       ['master_timeout']             = (time) Explicit operation timeout for connection to master node
       ['timeout']                    = (time) Explicit operation timeout
       ['wait_for_active_shards']     = (number) Wait until the specified number of shards is active
       ['wait_for_nodes']             = (number) Wait until the specified number of nodes is available
       ['wait_for_relocating_shards'] = (number) Wait until the specified number of relocating shards is finished
       ['wait_for_status']            = (enum) Wait until cluster is in a specific state
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->cluster()->health($params);

/*
$params['dry_run']         = (boolean) Simulate the operation only and return the resulting state
       ['filter_metadata'] = (boolean) Don't return cluster state metadata (default: false)
       ['body']            = (boolean) Don't return cluster state metadata (default: false)
       ['explain']         = (boolean) Return an explanation of why the commands can or cannot be executed
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->cluster()->reroute($params);

/*
$params['filter_blocks']          = (boolean) Do not return information about blocks
       ['filter_index_templates'] = (boolean) Do not return information about index templates
       ['filter_indices']         = (list) Limit returned metadata information to specific indices
       ['filter_metadata']        = (boolean) Do not return information about indices metadata
       ['filter_nodes']           = (boolean) Do not return information about nodes
       ['filter_routing_table']   = (boolean) Do not return information about shard allocation (`routing_table` and `routing_nodes`)
       ['local']                  = (boolean) Return local information, do not retrieve the state from master node (default: false)
       ['master_timeout']         = (time) Specify timeout for connection to master
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->cluster()->state($params);

/*
$params['flat_settings']          = (boolean) Return settings in flat format (default: false)
       ['human'] = (boolean) Whether to return time and byte values in human-readable format.
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

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

/*
$params['body'] = ()
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->cluster()->putSettings($params);

/*
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->cluster()->getSettings($params);

/*
$params['local']   = (bool) Return local information, do not retrieve the state from master node (default: false)
       ['master_timeout']  = (time) Specify timeout for connection to master
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->cluster()->pendingTasks($params);

/*
$params['include_yes_decisions'] = (bool) Return 'YES' decisions in explanation (default: false)
       ['body']  = (array) Request body
*/

$params = [
    // ...
];

$client = ClientBuilder::create()->build();
$response = $client->cluster()->allocationExplain($params);