Added Max aggregation

Author: Spamercz

src/Aggregation/Max.php

@@ -0,0 +1,37 @@
+<?php declare(strict_types = 1);
+
+namespace Spameri\ElasticQuery\Aggregation;
+
+class Max implements \Spameri\ElasticQuery\Aggregation\LeafAggregationInterface
+{
+
+	private string $field;
+
+
+	public function __construct(
+		string $field
+	)
+	{
+		$this->field = $field;
+	}
+
+
+	public function key(): string
+	{
+		return 'max_' . $this->field;
+	}
+
+
+	/**
+	 * @return array<string, array<string, string>>
+	 */
+	public function toArray(): array
+	{
+		return [
+			'max' => [
+				'field' => $this->field,
+			],
+		];
+	}
+
+}