Remove irrelevant warning (#1200)

* Remove irrelevant warning

This commit removes an old warning which is no longer relevant to any supported
stack version. It is noisy and there is no action for the user to take.

* Add changelog entry for log removal

* 12.0.1 release prep

Update version in preparation for a release.

Author: donoghuc

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 12.0.1
+ - Remove irrelevant log warning about elastic stack version [#1200](https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1200)
+
 ## 12.0.0
   - SSL settings that were marked deprecated in version `11.14.0` are now marked obsolete, and will prevent the plugin from starting.
   - These settings are:

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

@@ -515,20 +515,13 @@ def set_last_es_version(version, url)
       major = major_version(version)
       if @maximum_seen_major_version.nil?
         @logger.info("Elasticsearch version determined (#{version})", es_version: major)
-        set_maximum_seen_major_version(major)
+        @maximum_seen_major_version = major
       elsif major > @maximum_seen_major_version
         warn_on_higher_major_version(major, url)
         @maximum_seen_major_version = major
       end
     end
 
-    def set_maximum_seen_major_version(major)
-      if major >= 6
-        @logger.warn("Detected a 6.x and above cluster: the `type` event field won't be used to determine the document _type", es_version: major)
-      end
-      @maximum_seen_major_version = major
-    end
-
     def warn_on_higher_major_version(major, url)
       @logger.warn("Detected a node with a higher major version than previously observed, " +
                    "this could be the result of an Elasticsearch cluster upgrade",

logstash-output-elasticsearch.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name            = 'logstash-output-elasticsearch'
-  s.version         = '12.0.0'
+  s.version         = '12.0.1'
   s.licenses        = ['apache-2.0']
   s.summary         = "Stores logs in Elasticsearch"
   s.description     = "This gem is a Logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/logstash-plugin install gemname. This gem is not a stand-alone program"