Make whereHasNull and orWhereHasNull accept sub query as second parameter

Author: ShisunXia

README.md

@@ -404,7 +404,8 @@ The package is developed and tested under Elasticsearch ``v6.*``. It should be a
 
    | Name     | Required | Type                    | Default   | Description                                           |
    |:--------:|:--------:|:-----------------------:|:---------:|:-----------------------------------------------------:|
-   | relation | Y        | ``string``, ``callable``|           | Must be capitalized                                   |
+   | relation | Y        | ``string``              |           | Must be capitalized                                   |
+   | closure  |          | ``null``, ``callable``  |``null``   |                                                       |
 
 * Output
    
@@ -416,12 +417,20 @@ The package is developed and tested under Elasticsearch ``v6.*``. It should be a
       // find all users with no someRelation
       User::es()->whereHasNull('someRelations')->first();
       ```
+   2. with sub query
+      ```php
+      // find all users with no someRelation with id = 1
+      User::es()->whereHasNull('someRelations', function($q) {
+          $q->where('id', 1);
+      })->first();
+      ```
 #### orWhereHasNull
 * Parameters
 
    | Name     | Required | Type                    | Default   | Description                                           |
    |:--------:|:--------:|:-----------------------:|:---------:|:-----------------------------------------------------:|
-   | relation | Y        | ``string``, ``callable``|           | Must be capitalized                                   |
+   | relation | Y        | ``string``              |           | Must be capitalized                                   |
+   | closure  |          | ``null``, ``callable``  |``null``   |                                                       |
 
 * Output
    

src/LaravelElasticsearchQueryBuilder.php

@@ -378,35 +378,51 @@ public function whereHas($column, $closure = null, $or = false, $boost = false)
 
 	/**
 	 * @param $column
+	 * @param null $closure
 	 * @param bool $or
 	 * @return $this
 	 */
-	public function whereHasNull($column, $or = false) {
-		$this->query['bool'][$or ? 'should' : 'filter'][] = [
-			'bool' => [
-				'must_not' => [
-					[
-						'nested' => [
-							'path' => strtolower($column),
-							'query' => [
-								'exists' => [
-									'field' => strtolower($column)
+	public function whereHasNull($column, $closure = null, $or = false) {
+		if($closure === null) {
+			$this->query['bool'][$or ? 'should' : 'filter'][] = [
+				'bool' => [
+					'must_not' => [
+						[
+							'nested' => [
+								'path' => strtolower($column),
+								'query' => [
+									'exists' => [
+										'field' => strtolower($column)
+									]
 								]
 							]
 						]
 					]
 				]
-			]
-		];
+			];
+		} else {
+			$column_bak = $column;
+			$this->getMappingProperty($column, true);
+			$builder = $this->nested_queries[$column_bak] ?? new LaravelElasticsearchQueryBuilder($this->model, $column_bak);
+			$closure($builder);
+			$nested_query = $this->createNestedQuery($column_bak, $builder, '');
+			$this->query['bool'][$or ? 'should' : 'filter'][] = [
+				'bool' => [
+					'must_not' => $nested_query
+				]
+			];
+		}
+
 		return $this;
 	}
 
 	/**
 	 * @param $column
+	 * @param null $closure
 	 * @return LaravelElasticsearchQueryBuilder
 	 */
-	public function orWhereHasNull($column) {
-		return $this->whereHasNull($column, true);
+	public function orWhereHasNull($column, $closure = null) {
+		return $this->whereHasNull($column, $closure, $or = true);
 	}
 
 	/**