Fix: updated documentation on support for ES6

Author: rupozzi

docs/source/AdministratorGuide/ExternalsSupport/index.rst

@@ -57,7 +57,6 @@ ElasticSearch versions:
 
 ElasticSearch is an optional dependency for DIRAC servers installations. Supported versions:
 
-- 6.x
 - 7.x
 
 ElasticSearch server is not shipped with DIRAC. You are responsible of its administration.

docs/source/AdministratorGuide/Systems/MonitoringSystem/index.rst

@@ -23,8 +23,7 @@ Install Elasticsearch
 ======================
 
 This is not covered here, as installation and administration of ES are not part of DIRAC guide.
-Just a note on the ES versions supported: ES7 and ES6 are supported, the support for ES5 is not assured,
-and the one for ES6 will be dropped in a future release.
+Just a note on the ES versions supported: only ES7+ versions are currently supported, and are later to be replaced by OpenSearch services.
 
 Configure the MonitoringSystem
 ===============================