Get Settings API

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Get Settings API will show you the currently configured settings for one or more indexes:

// Get settings for one index
$params = ['index' => 'my_index'];
$response = $client->indices()->getSettings($params);

// Get settings for several indices
$params = [
    'index' => [ 'my_index', 'my_index2' ]
];
$response = $client->indices()->getSettings($params);