Remove warning message

Since openseach supports only version 7, remove irrelevant warning
message.

Signed-off-by: Vijayan Balasubramanian <[email protected]>

Author: VijayanB

lib/logstash/outputs/opensearch/http_client/pool.rb

@@ -432,7 +432,7 @@ def set_last_version(version, url)
 
       major = major_version(version)
       if @maximum_seen_major_version.nil?
-        @logger.info("OpenSearch version determined (#{version})", version: major)
+        @logger.info("Cluster version determined (#{version})", version: major)
         set_maximum_seen_major_version(major)
       elsif major > @maximum_seen_major_version
         warn_on_higher_major_version(major, url)
@@ -441,7 +441,6 @@ def set_last_version(version, url)
     end
 
     def set_maximum_seen_major_version(major)
-      @logger.warn("the `type` event field won't be used to determine the document _type")
       @maximum_seen_major_version = major
     end