Added support for [min_score](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-body.html#request-body-search-min-score). Requested in #122 and #101. (babenkoivan#350)

Author: hoersten

README.md

@@ -265,6 +265,14 @@ App\MyModel::search('*')
     ->get();
 ```
 
+And filter out results with a score less than [min_score](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-body.html#request-body-search-min-score): 
+
+```php
+App\MyModel::search('sales')
+    ->minScore(1.0)
+    ->get();
+```
+
 At last, if you want to send a custom request, you can use the `searchRaw` method:
 
 ```php

src/Builders/FilterBuilder.php

@@ -46,6 +46,13 @@ class FilterBuilder extends Builder
      */
     public $select = [];
 
+    /**
+     * The min_score parameter.
+     *
+     * @var string
+     */
+    public $minScore;
+
     /**
      * FilterBuilder constructor.
      *
@@ -524,6 +531,19 @@ public function select($fields)
         return $this;
     }
 
+    /**
+     * Set the min_score on the filter.
+     *
+     * @param  float  $score
+     * @return $this
+     */
+    public function minScore($score)
+    {
+        $this->minScore = $score;
+
+        return $this;
+    }
+
     /**
      * Get the count.
      *

src/ElasticEngine.php

@@ -138,6 +138,7 @@ public function buildSearchQueryPayloadCollection(Builder $builder, array $optio
                 ->setIfNotEmpty('body.sort', $builder->orders)
                 ->setIfNotEmpty('body.explain', $options['explain'] ?? null)
                 ->setIfNotEmpty('body.profile', $options['profile'] ?? null)
+                ->setIfNotEmpty('body.min_score', $builder->minScore)
                 ->setIfNotNull('body.from', $builder->offset)
                 ->setIfNotNull('body.size', $builder->limit);
 

tests/Builders/FilterBuilderTest.php

@@ -483,4 +483,22 @@ public function testOnlyTrashed()
             $builder->wheres
         );
     }
+
+    public function testMinScore()
+    {
+        $builder = (new FilterBuilder($this->mockModel()));
+
+        $this->assertSame(
+            null,
+            $builder->minScore
+        );
+
+        $builder = (new FilterBuilder($this->mockModel()))
+            ->minScore(0.5);
+
+        $this->assertSame(
+            0.5,
+            $builder->minScore
+        );
+    }
 }