Added new elasticsearch-datastream destination.

Signed-off-by: Zsolt Gyulai (zgyulai) <zsolt.gyulai@quest.com>

Author: zsoltgyulai94

doc/_admin-guide/070_Destinations/035_elasticsearch-datastream/README.md

@@ -0,0 +1,30 @@
+---
+title: 'elasticsearch-datastream: Elasticsearch data streams'
+short_title: elasticsearch-datastream
+id: adm-dest-es-datastream
+description: >-
+From syslog-ng OSE 4.8 and later versions, you  can send messages and metrics to [Elasticsearch data streams](https://www.elastic.co/guide/en/elasticsearch/reference/current/data-streams.html) to store your log and metrics data as time series data..
+---
+
+**Declaration**
+
+```config
+destination d_elastic_data_stream {
+  elasticsearch-datastream(
+    url("https://elastic-endpoint:9200/my-data-stream/_bulk")
+    user("elastic")
+    password("ba253DOn434Tc0pY22OI")
+  );
+};
+```
+This driver is a reusable configuration snippet configured to send log messages using the http() driver using a template. You can find the source of this configuration snippet on [GitHub](https://github.com/axoflow/axosyslog/blob/main/scl/elasticsearch/elastic-datastream.conf).
+
+## Prerequisites
+
+* An account for Elasticsearch datastreams with a username and a password.
+
+## Options
+
+Elasticsearch datastream is an HTTP based driver, hence it utilizes the HTTP destination options.
+
+> *Copyright © 2024 Axoflow*