Switch to 'simple_query_string' search type by default.

Author: olsgreen

README.md

@@ -9,6 +9,8 @@ This driver has a simple configuration, requiring you to only publish the config
 
 Note that this driver uses a separate index for each model type as elasticsearch mapping types have been deprecated in elasticsearch 6.0 and will be removed in 8.0, for more information see https://bit.ly/2TZVZvq.
 
+By default, the driver uses the `simple_query_string' full text parser with `and` set as the default operator. More information on the functionality & syntax of this query format can be found (here)[https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-simple-query-string-query.html].
+
 Based on the original work of [ErickTamayo](https://github.com/ErickTamayo/laravel-scout-elastic). **Requires Scout ^5.0, ^6.0, or ^7.0, Laravel >=5.4, PHP >=7.0**
 
 ## Contents

src/ElasticsearchEngine.php

@@ -144,7 +144,12 @@ protected function performSearch(Builder $builder, array $options = [])
             'body' => [
                 'query' => [
                     'bool' => [
-                        'must' => [['query_string' => [ 'query' => "*{$builder->query}*"]]]
+                        'must' => [
+                            ["simple_query_string" => [
+                                "query" => $builder->query,
+                                "default_operator" => "and"
+                            ]]
+                        ]
                     ]
                 ]
             ]

tests/ElasticsearchEngineTest.php

@@ -62,7 +62,9 @@ public function test_search_sends_correct_parameters_to_elasticsearch()
                 'query' => [
                     'bool' => [
                         'must' => [
-                            ['query_string' => ['query' => '*zonda*']],
+                            ['simple_query_string' => [
+                            'query' => 'zonda',
+                            "default_operator" => "and"]],
                             ['match_phrase' => ['foo' => 1]],
                             ['terms' => ['bar' => [1, 3]]],
                         ]