added matchall query

Author: Spamercz

src/Query/MatchAll.php

@@ -0,0 +1,44 @@
+<?php declare(strict_types = 1);
+
+namespace Spameri\ElasticQuery\Query;
+
+/**
+ * Match all documents query.
+ *
+ * @see https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-match-all-query.html
+ */
+class MatchAll implements \Spameri\ElasticQuery\Query\LeafQueryInterface
+{
+
+	public function __construct(
+		private float $boost = 1.0,
+	)
+	{
+	}
+
+
+	public function key(): string
+	{
+		return 'match_all';
+	}
+
+
+	/**
+	 * @return array<string, mixed>
+	 */
+	public function toArray(): array
+	{
+		if ($this->boost !== 1.0) {
+			return [
+				'match_all' => [
+					'boost' => $this->boost,
+				],
+			];
+		}
+
+		return [
+			'match_all' => new \stdClass(),
+		];
+	}
+
+}