Added Nested aggregation

Author: Spamercz

src/Aggregation/Nested.php

@@ -0,0 +1,33 @@
+<?php declare(strict_types = 1);
+
+namespace Spameri\ElasticQuery\Aggregation;
+
+class Nested implements \Spameri\ElasticQuery\Aggregation\LeafAggregationInterface
+{
+
+	private string $path;
+
+
+	public function __construct(
+		string $path
+	) {
+		$this->path = $path;
+	}
+
+
+	public function key(): string
+	{
+		return 'nested_' . $this->path;
+	}
+
+
+	public function toArray(): array
+	{
+		return [
+			'nested' => [
+				'path' => $this->path,
+			],
+		];
+	}
+
+}