Only overwrite field parameter of...

Only overwrite field parameter of \ONGR\ElasticsearchDSL\Suggest\CompletionSuggest if parameter not configured

src/Suggest/CompletionSuggest.php

@@ -62,7 +62,9 @@ class CompletionSuggest implements BuilderInterface
      */
     public function toArray()
     {
-        $this->addParameter('field', 'suggest');
+        if (!$this->hasParameter('field')) {
+            $this->addParameter('field', 'suggest');
+        }
 
         if (!$this->hasParameter('size')) {
             $this->addParameter('size', self::DEFAULT_SIZE);

tests/Suggest/CompletionSuggestTest.php

@@ -56,6 +56,27 @@ class CompletionSuggestTest extends \PHPUnit_Framework_TestCase
                 'fuzzy' => ['fuzziness' => 2]
             ]
         );
+        $expected = ['foo' => [
+            'text' => 'bar',
+            'completion' => [
+                'field' => 'title',
+                'size' => 5,
+                'fuzzy' => ['fuzziness' => 2]
+            ],
+        ]];
+        $this->assertEquals($expected, $suggest->toArray());
+    }
+
+    public function testToArrayWithoutField()
+    {
+        $suggest = new CompletionSuggest(
+            'foo',
+            'bar',
+            [
+                'size' => 5,
+                'fuzzy' => ['fuzziness' => 2]
+            ]
+        );
         $expected = ['foo' => [
             'text' => 'bar',
             'completion' => [