Add weighted_avg to aggregration DSL (#1814)

This follows PR #1771 which added this aggregation but didn't expose it to DSL.

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Ability to specify the type of authentication manually by the `auth_type` parameter (in the client class config) was added (allowed values are `basic, digest, gssnegotiate, ntlm`)
 * Added `if_seq_no` / `if_primary_term` to replace `version` for [optimistic concurrency control](https://www.elastic.co/guide/en/elasticsearch/reference/6.8/optimistic-concurrency-control.html)
 * Added `Elastica\Aggregation\PercentilesBucket` aggregation [#1806](https://github.com/ruflin/Elastica/pull/1806)
+* Added `weighted_avg` to aggregations DSL [#1814](https://github.com/ruflin/Elastica/pull/1814)
 * Supported PHP 8.0 [#1794](https://github.com/ruflin/Elastica/pull/1794)
 ### Changed
 * Allow `string` such as `wait_for` to be passed to `AbstractUpdateAction::setRefresh` [#1791](https://github.com/ruflin/Elastica/pull/1791)

src/QueryBuilder/DSL/Aggregation.php

@@ -36,6 +36,7 @@
 use Elastica\Aggregation\Terms;
 use Elastica\Aggregation\TopHits;
 use Elastica\Aggregation\ValueCount;
+use Elastica\Aggregation\WeightedAvg;
 use Elastica\Exception\NotImplementedException;
 use Elastica\Query\AbstractQuery;
 use Elastica\QueryBuilder\DSL;
@@ -442,4 +443,14 @@ public function diversified_sampler(string $name): DiversifiedSampler
     {
         return new DiversifiedSampler($name);
     }
+
+    /**
+     * weighted avg aggregation.
+     *
+     * @see https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-weight-avg-aggregation.html
+     */
+    public function weighted_avg(string $name): WeightedAvg
+    {
+        return new WeightedAvg($name);
+    }
 }

src/QueryBuilder/Version/Version700.php

@@ -91,6 +91,7 @@ class Version700 extends Version
         'geohash_grid',
         'bucket_script',
         'serial_diff',
+        'weighted_avg',
     ];
 
     protected $suggesters = [

tests/QueryBuilder/DSL/AggregationTest.php

@@ -63,5 +63,6 @@ public function testInterface(): void
         $this->_assertImplemented($aggregationDSL, 'adjacency_matrix', Aggregation\AdjacencyMatrix::class, ['name']);
         $this->_assertImplemented($aggregationDSL, 'sampler', Aggregation\Sampler::class, ['name']);
         $this->_assertImplemented($aggregationDSL, 'diversified_sampler', Aggregation\DiversifiedSampler::class, ['name']);
+        $this->_assertImplemented($aggregationDSL, 'weighted_avg', Aggregation\WeightedAvg::class, ['name']);
     }
 }