Add note about minimum version of OpenSearch (#124)

* fix: add note about minimum version of OpenSearch

* fix: doc style

Author: lukmzig

doc/01_Installation/README.md

@@ -4,6 +4,8 @@
 
  This bundle is only supported on Pimcore Core Framework 11.
 
+ This bundle requires minimum version of OpenSearch 2.7.
+
 :::
 
  ## Bundle Installation

doc/02_Configuration/04_Opensearch.md

@@ -1,5 +1,11 @@
 # OpenSearch Client Setup
 
+:::info
+
+This bundle requires minimum version of OpenSearch 2.7.
+
+:::
+
 Following configuration is required to set up OpenSearch. The OpenSearch client configuration takes place via [Pimcore Opensearch Client](https://github.com/pimcore/opensearch-client) and has two parts:
 1) Configuring an OpenSearch client.
 2) Define the client to be used by Generic Data Index bundle.