Add elastic search formatter

src/Monolog/Formatter/ElasticSearchFormatter.php

@@ -0,0 +1,87 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of the Monolog package.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Monolog\Formatter;
+
+/**
+ * Format a log message into an ElasticSearch record
+ *
+ * @author Avtandil Kikabidze <akalongman@gmail.com>
+ */
+class ElasticSearchFormatter extends NormalizerFormatter
+{
+    /**
+     * @var string ElasticSearch index name
+     */
+    protected $index;
+
+    /**
+     * @var string ElasticSearch record type
+     */
+    protected $type;
+
+    /**
+     * @param string $index ElasticSearch index name
+     * @param string $type ElasticSearch record type
+     */
+    public function __construct($index, $type)
+    {
+        // ElasticSearch requires an ISO 8601 format date with optional millisecond precision.
+        parent::__construct('Y-m-d\TH:i:s.uP');
+
+        $this->index = $index;
+        $this->type = $type;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function format(array $record)
+    {
+        $record = parent::format($record);
+
+        return $this->getDocument($record);
+    }
+
+    /**
+     * Getter index
+     *
+     * @return string
+     */
+    public function getIndex(): string
+    {
+        return $this->index;
+    }
+
+    /**
+     * Getter type
+     *
+     * @return string
+     */
+    public function getType(): string
+    {
+        return $this->type;
+    }
+
+    /**
+     * Convert a log message into an ElasticSearch record
+     *
+     * @param  array $record Log message
+     * @return array
+     */
+    protected function getDocument($record): array
+    {
+        $record['_index'] = $this->index;
+        $record['_type'] = $this->type;
+
+        return $record;
+    }
+}