Update ElasticsearchWriter docs for 5.x support only

refs #5911

diff --git a/doc/14-features.md b/doc/14-features.md
index e2fdeb591add0c6e827a211e604781e4a24f8f38..9f4db6a7895d73168e52122db84b79965901bc46 100644 (file)
--- a/doc/14-features.md
+++ b/doc/14-features.md
@@ -347,7 +347,7 @@ The check results include parsed performance data metrics if enabled.
 
 > **Note**
 >
-> Elasticsearch 5.x+ is required.
+> Elasticsearch 5.x is required. This feature has been successfully tested with Elasticsearch 5.6.4.
 
 Enable the feature and restart Icinga 2.