Fixed bug which prevented a field query as described in the example:

extensions/yii/elasticsearch/QueryBuilder.php

@@ -55,8 +55,10 @@ class QueryBuilder extends \yii\base\Object
 			$parts['from'] = (int) $query->offset;
 		}
 
-		if (empty($parts['query'])) {
+		if (empty($query->query)) {
 			$parts['query'] = ["match_all" => (object)[]];
+		} else {
+			$parts['query'] = $query->query;
 		}
 
 		$whereFilter = $this->buildCondition($query->where);

tests/unit/extensions/elasticsearch/QueryBuilderTest.php

+<?php
+
+namespace yiiunit\extensions\elasticsearch;
+
+use yii\elasticsearch\Query;
+use yii\elasticsearch\QueryBuilder;
+
+/**
+ * @group elasticsearch
+ */
+class QueryBuilderTest extends ElasticSearchTestCase
+{
+
+	public function setUp()
+	{
+		parent::setUp();
+		$command = $this->getConnection()->createCommand();
+		$command->deleteAllIndexes();
+	}
+
+	private function prepareDbData()
+	{
+		$command = $this->getConnection()->createCommand();
+		$command->insert('test', 'article', ['title' => 'I love yii!'], 1);
+		$command->insert('test', 'article', ['title' => 'Symfony2 is another framework'], 2);
+		$command->insert('test', 'article', ['title' => 'Yii2 out now!'], 3);
+		$command->insert('test', 'article', ['title' => 'yii test'], 4);
+
+		$command->flushIndex();
+	}
+
+	public function testQueryBuilderRespectsQuery()
+	{
+		$queryParts = ['field' => ['title' => 'yii']];
+		$queryBuilder = new QueryBuilder($this->getConnection());
+		$query = new Query();
+		$query->query = $queryParts;
+		$build = $queryBuilder->build($query);
+		$this->assertTrue(array_key_exists('queryParts', $build));
+		$this->assertTrue(array_key_exists('query', $build['queryParts']));
+		$this->assertFalse(array_key_exists('match_all', $build['queryParts']), 'Match all should not be set');
+		$this->assertSame($queryParts, $build['queryParts']['query']);
+	}
+
+	public function testYiiCanBeFoundByQuery()
+	{
+		$this->prepareDbData();
+		$queryParts = ['field' => ['title' => 'yii']];
+		$query = new Query();
+		$query->from('test', 'article');
+		$query->query = $queryParts;
+		$result = $query->search($this->getConnection());
+		$this->assertEquals(2, $result['hits']['total']);
+	}
+
+	public function testFuzzySearch()
+	{
+		$this->prepareDbData();
+		$queryParts = [
+			"fuzzy_like_this" => [
+				"fields" => ["title"],
+				"like_text" => "Similar to YII",
+				"max_query_terms" => 4
+			]
+		];
+		$query = new Query();
+		$query->from('test', 'article');
+		$query->query = $queryParts;
+		$result = $query->search($this->getConnection());
+		$this->assertEquals(3, $result['hits']['total']);
+	}
+}
+