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Heterogeneous batches are OK

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Heterogeneous batches are OK

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It is possible to queue up heterogeneous batches of requests. For example, you can queue up several GETs, indexing requests and a search:

$client = ClientBuilder::create()->build();
$futures = [];

$params = [
    'index' => 'test',
    'type' => 'test',
    'id' => 1,
    'client' => [
        'future' => 'lazy'
    ]
];

$futures['getRequest'] = $client->get($params);     // First request

$params = [
    'index' => 'test',
    'type' => 'test',
    'id' => 2,
    'body' => [
        'field' => 'value'
    ],
    'client' => [
        'future' => 'lazy'
    ]
];

$futures['indexRequest'] = $client->index($params);       // Second request

$params = [
    'index' => 'test',
    'type' => 'test',
    'body' => [
        'query' => [
            'match' => [
                'field' => 'value'
            ]
        ]
    ],
    'client' => [
        'future' => 'lazy'
    ]
];

$futures['searchRequest'] = $client->search($params);      // Third request

// Resolve futures...blocks until network call completes
$searchResults = $futures['searchRequest']['hits'];

// Should return immediately, since the previous future resolved the entire batch
$doc = $futures['getRequest']['_source'];

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