Fix #902 Incorrect return typehint when using async requests

Author: ezimuel

src/Elasticsearch/Client.php

@@ -1550,9 +1550,9 @@ private function verifyNotNullOrEmpty(string $name, $var)
     }
 
     /**
-     * @throws \Exception
+     * @return callable|array
      */
-    private function performRequest(AbstractEndpoint $endpoint): array
+    private function performRequest(AbstractEndpoint $endpoint)
     {
         $promise =  $this->transport->performRequest(
             $endpoint->getMethod(),

tests/Elasticsearch/Tests/ClientTest.php

@@ -8,6 +8,8 @@
 use Elasticsearch\Client;
 use Elasticsearch\ClientBuilder;
 use Elasticsearch\Common\Exceptions\MaxRetriesException;
+use GuzzleHttp\Ring\Client\MockHandler;
+use GuzzleHttp\Ring\Future\FutureArray;
 use Mockery as m;
 
 /**
@@ -445,4 +447,28 @@ public function testExtendedHosts()
         $this->assertSame("http", $host->getTransportSchema());
         $this->assertSame("user:abc#$@?%!abc", $host->getUserPass());
     }
+
+    public function testClientLazy()
+    {
+        $handler = new MockHandler([
+          'status' => 200,
+          'transfer_stats' => [
+             'total_time' => 100
+          ],
+          'body' => '{test}',
+          'effective_url' => 'localhost'
+        ]);
+        $builder = ClientBuilder::create();
+        $builder->setHosts(['somehost']);
+        $builder->setHandler($handler);
+        $client = $builder->build();
+
+        $params = [
+            'client' => [
+                'future' => 'lazy',
+            ]
+        ];
+        $result = $client->info($params);
+        $this->assertInstanceOf(FutureArray::class, $result);
+    }
 }