Add support to disable the _all field for a type

DependencyInjection/Configuration.php

@@ -288,6 +288,7 @@ class Configuration implements ConfigurationInterface
                 ->append($this->getBoostNode())
                 ->append($this->getRoutingNode())
                 ->append($this->getParentNode())
+                ->append($this->getAllNode())
             ->end()
         ;
 
@@ -530,4 +531,21 @@ class Configuration implements ConfigurationInterface
 
         return $node;
     }
+
+    /**
+     * Returns the array node used for "_all"
+     */
+    protected function getAllNode()
+    {
+        $builder = new TreeBuilder();
+        $node = $builder->root('_all');
+
+        $node
+            ->children()
+            ->scalarNode('enabled')->defaultValue(true)->end()
+            ->end()
+        ;
+
+        return $node;
+    }
 }

DependencyInjection/FOSElasticaExtension.php

@@ -231,6 +231,9 @@ class FOSElasticaExtension extends Extension
             if (isset($type['index'])) {
                 $this->indexConfigs[$indexName]['config']['mappings'][$name]['index'] = $type['index'];
             }
+            if (isset($type['_all'])) {
+                $this->indexConfigs[$indexName]['config']['mappings'][$name]['_all'] = $type['_all'];
+            }
         }
     }