diff --git a/.github/workflows/links.yml b/.github/workflows/links.yml
new file mode 100644
index 0000000..faf49f7
--- /dev/null
+++ b/.github/workflows/links.yml
@@ -0,0 +1,25 @@
+name: Link Checker
+on:
+  push:
+    branches:
+      - "*"
+  pull_request:
+    branches:
+      - "*"
+
+jobs:
+  linkchecker:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: lychee Link Checker
+        id: lychee
+        uses: lycheeverse/lychee-action@master
+        with:
+          args: --accept=200,403,429  "**/*.html" "**/*.md" "**/*.txt" "**/*.json"
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+      - name: Fail if there were link errors
+        run: exit ${{ steps.lychee.outputs.exit_code }}
\ No newline at end of file
diff --git a/lib/logstash/outputs/opensearch/http_client.rb b/lib/logstash/outputs/opensearch/http_client.rb
index 618b35d..af09e88 100644
--- a/lib/logstash/outputs/opensearch/http_client.rb
+++ b/lib/logstash/outputs/opensearch/http_client.rb
@@ -93,8 +93,8 @@ def template_install(name, template, force=false)
       template_put(name, template)
     end
 
-    def last_es_version
-      @pool.last_es_version
+    def last_version
+      @pool.last_version
     end
 
     def maximum_seen_major_version
diff --git a/lib/logstash/outputs/opensearch/http_client/pool.rb b/lib/logstash/outputs/opensearch/http_client/pool.rb
index 78e298e..68a80f6 100644
--- a/lib/logstash/outputs/opensearch/http_client/pool.rb
+++ b/lib/logstash/outputs/opensearch/http_client/pool.rb
@@ -77,7 +77,7 @@ def initialize(logger, adapter, initial_urls=[], options={})
       @url_info = {}
       @stopping = false
 
-      @last_es_version = Concurrent::AtomicReference.new
+      @last_version = Concurrent::AtomicReference.new
     end
 
     def start
@@ -233,10 +233,10 @@ def healthcheck!
           # If no exception was raised it must have succeeded!
           logger.warn("Restored connection to ES instance", url: url.sanitized.to_s)
           # We reconnected to this node, check its ES version
-          es_version = get_es_version(url)
+          version = get_version(url)
           @state_mutex.synchronize do
-            meta[:version] = es_version
-            set_last_es_version(es_version, url)
+            meta[:version] = version
+            set_last_version(version, url)
             meta[:state] = :alive
           end
         rescue HostUnreachableError, BadResponseCodeError => e
@@ -412,14 +412,13 @@ def return_connection(url)
       end
     end
 
-    def get_es_version(url)
+    def get_version(url)
       request = perform_request_to_url(url, :get, ROOT_URI_PATH)
       LogStash::Json.load(request.body)["version"]["number"] # e.g. "7.10.0"
-      #return "7.10.2"
     end
 
-    def last_es_version
-      @last_es_version.get
+    def last_version
+      @last_version.get
     end
 
     def maximum_seen_major_version
@@ -429,12 +428,12 @@ def maximum_seen_major_version
     private
 
     # @private executing within @state_mutex
-    def set_last_es_version(version, url)
-      @last_es_version.set(version)
+    def set_last_version(version, url)
+      @last_version.set(version)
 
       major = major_version(version)
       if @maximum_seen_major_version.nil?
-        @logger.info("OpenSearch version determined (#{version})", es_version: major)
+        @logger.info("OpenSearch version determined (#{version})", version: major)
         set_maximum_seen_major_version(major)
       elsif major > @maximum_seen_major_version
         warn_on_higher_major_version(major, url)
diff --git a/lib/logstash/outputs/opensearch/template_manager.rb b/lib/logstash/outputs/opensearch/template_manager.rb
index e80d6e6..0f80dd1 100644
--- a/lib/logstash/outputs/opensearch/template_manager.rb
+++ b/lib/logstash/outputs/opensearch/template_manager.rb
@@ -9,7 +9,7 @@
 
 module LogStash; module Outputs; class OpenSearch
   class TemplateManager
-    # To be mixed into the elasticsearch plugin base
+    # To be mixed into the opensearch plugin base
     def self.install_template(plugin)
       return unless plugin.manage_template
       if plugin.template
@@ -26,11 +26,11 @@ def self.install_template(plugin)
     end
 
     private
-    def self.load_default_template(es_major_version, ecs_compatibility)
-      template_path = default_template_path(es_major_version, ecs_compatibility)
+    def self.load_default_template(major_version, ecs_compatibility)
+      template_path = default_template_path(major_version, ecs_compatibility)
       read_template_file(template_path)
     rescue => e
-      fail "Failed to load default template for Elasticsearch v#{es_major_version} with ECS #{ecs_compatibility}; caused by: #{e.inspect}"
+      fail "Failed to load default template for OpenSearch v#{major_version} with ECS #{ecs_compatibility}; caused by: #{e.inspect}"
     end
 
     def self.install(client, template_name, template, template_overwrite)
@@ -45,9 +45,9 @@ def self.template_name(plugin)
       plugin.template_name
     end
 
-    def self.default_template_path(es_major_version, ecs_compatibility=:disabled)
-      template_version = es_major_version
-      default_template_name = "templates/ecs-#{ecs_compatibility}/elasticsearch-#{template_version}x.json"
+    def self.default_template_path(major_version, ecs_compatibility=:disabled)
+      template_version = major_version
+      default_template_name = "templates/ecs-#{ecs_compatibility}/#{template_version}x.json"
       ::File.expand_path(default_template_name, ::File.dirname(__FILE__))
     end
 
diff --git a/lib/logstash/outputs/opensearch/templates/ecs-disabled/elasticsearch-1x.json b/lib/logstash/outputs/opensearch/templates/ecs-disabled/1x.json
similarity index 100%
rename from lib/logstash/outputs/opensearch/templates/ecs-disabled/elasticsearch-1x.json
rename to lib/logstash/outputs/opensearch/templates/ecs-disabled/1x.json
diff --git a/lib/logstash/outputs/opensearch/templates/ecs-disabled/elasticsearch-7x.json b/lib/logstash/outputs/opensearch/templates/ecs-disabled/7x.json
similarity index 100%
rename from lib/logstash/outputs/opensearch/templates/ecs-disabled/elasticsearch-7x.json
rename to lib/logstash/outputs/opensearch/templates/ecs-disabled/7x.json
diff --git a/lib/logstash/plugin_mixins/opensearch/common.rb b/lib/logstash/plugin_mixins/opensearch/common.rb
index 632d4a8..bfd023a 100644
--- a/lib/logstash/plugin_mixins/opensearch/common.rb
+++ b/lib/logstash/plugin_mixins/opensearch/common.rb
@@ -58,8 +58,8 @@ def finish_register
     end
     protected :finish_register
 
-    def last_es_version
-      client.last_es_version
+    def last_version
+      client.last_version
     end
 
     def maximum_seen_major_version
diff --git a/spec/integration/outputs/no_opensearch_on_startup_spec.rb b/spec/integration/outputs/no_opensearch_on_startup_spec.rb
index ef28366..f4702ea 100644
--- a/spec/integration/outputs/no_opensearch_on_startup_spec.rb
+++ b/spec/integration/outputs/no_opensearch_on_startup_spec.rb
@@ -10,7 +10,7 @@
 require "logstash/outputs/opensearch"
 require_relative "../../../spec/opensearch_spec_helper"
 
-describe "elasticsearch is down on startup", :integration => true do
+describe "opensearch is down on startup", :integration => true do
   let(:event1) { LogStash::Event.new("somevalue" => 100, "@timestamp" => "2014-11-17T20:37:17.223Z", "@metadata" => {"retry_count" => 0}) }
   let(:event2) { LogStash::Event.new("message" => "a") }
 
@@ -41,22 +41,22 @@
     subject.close
   end
 
-  it 'should ingest events when Elasticsearch recovers before documents are sent' do
-    allow_any_instance_of(LogStash::Outputs::OpenSearch::HttpClient::Pool).to receive(:get_es_version).and_raise(::LogStash::Outputs::OpenSearch::HttpClient::Pool::HostUnreachableError.new(StandardError.new, "big fail"))
+  it 'should ingest events when OpenSearch recovers before documents are sent' do
+    allow_any_instance_of(LogStash::Outputs::OpenSearch::HttpClient::Pool).to receive(:get_version).and_raise(::LogStash::Outputs::OpenSearch::HttpClient::Pool::HostUnreachableError.new(StandardError.new, "big fail"))
     subject.register
-    allow_any_instance_of(LogStash::Outputs::OpenSearch::HttpClient::Pool).to receive(:get_es_version).and_return(OpenSearchHelper.version)
+    allow_any_instance_of(LogStash::Outputs::OpenSearch::HttpClient::Pool).to receive(:get_version).and_return(OpenSearchHelper.version)
     subject.multi_receive([event1, event2])
     @es.indices.refresh
     r = @es.search(index: 'logstash-*')
     expect(r).to have_hits(2)
   end
 
-  it 'should ingest events when Elasticsearch recovers after documents are sent' do
-    allow_any_instance_of(LogStash::Outputs::OpenSearch::HttpClient::Pool).to receive(:get_es_version).and_raise(::LogStash::Outputs::OpenSearch::HttpClient::Pool::HostUnreachableError.new(StandardError.new, "big fail"))
+  it 'should ingest events when OpenSearch recovers after documents are sent' do
+    allow_any_instance_of(LogStash::Outputs::OpenSearch::HttpClient::Pool).to receive(:get_version).and_raise(::LogStash::Outputs::OpenSearch::HttpClient::Pool::HostUnreachableError.new(StandardError.new, "big fail"))
     subject.register
     Thread.new do
       sleep 4
-      allow_any_instance_of(LogStash::Outputs::OpenSearch::HttpClient::Pool).to receive(:get_es_version).and_return(OpenSearchHelper.version)
+      allow_any_instance_of(LogStash::Outputs::OpenSearch::HttpClient::Pool).to receive(:get_version).and_return(OpenSearchHelper.version)
     end
     subject.multi_receive([event1, event2])
     @es.indices.refresh
diff --git a/spec/unit/outputs/opensearch/http_client/pool_spec.rb b/spec/unit/outputs/opensearch/http_client/pool_spec.rb
index ca66f9f..a57ec0f 100644
--- a/spec/unit/outputs/opensearch/http_client/pool_spec.rb
+++ b/spec/unit/outputs/opensearch/http_client/pool_spec.rb
@@ -16,7 +16,7 @@
   let(:adapter) { LogStash::Outputs::OpenSearch::HttpClient::ManticoreAdapter.new(logger) }
   let(:initial_urls) { [::LogStash::Util::SafeURI.new("http://localhost:9200")] }
   let(:options) { {:resurrect_delay => 2, :url_normalizer => proc {|u| u}} } # Shorten the delay a bit to speed up tests
-  let(:es_node_versions) { [ "0.0.0" ] }
+  let(:node_versions) { [ "0.0.0" ] }
 
   subject { described_class.new(logger, adapter, initial_urls, options) }
 
@@ -30,7 +30,7 @@
 
     allow(::Manticore::Client).to receive(:new).and_return(manticore_double)
 
-    allow(subject).to receive(:get_es_version).with(any_args).and_return(*es_node_versions)
+    allow(subject).to receive(:get_version).with(any_args).and_return(*node_versions)
   end
 
   after do
@@ -214,7 +214,7 @@
     end
 
     context "if there are nodes with multiple major versions" do
-      let(:es_node_versions) { [ "0.0.0", "6.0.0" ] }
+      let(:node_versions) { [ "0.0.0", "6.0.0" ] }
       it "picks the largest major version" do
         expect(subject.maximum_seen_major_version).to eq(6)
       end
diff --git a/spec/unit/outputs/opensearch/template_manager_spec.rb b/spec/unit/outputs/opensearch/template_manager_spec.rb
index 1caf92a..8e26406 100644
--- a/spec/unit/outputs/opensearch/template_manager_spec.rb
+++ b/spec/unit/outputs/opensearch/template_manager_spec.rb
@@ -15,7 +15,7 @@
   describe ".default_template_path" do
     context 'when ECS v1 is requested' do
       it 'resolves' do
-        expect(described_class.default_template_path(7, :v1)).to end_with("/templates/ecs-v1/elasticsearch-7x.json")
+        expect(described_class.default_template_path(7, :v1)).to end_with("/templates/ecs-v1/7x.json")
       end
     end
   end
diff --git a/spec/unit/outputs/opensearch_spec.rb b/spec/unit/outputs/opensearch_spec.rb
index d496872..91d2670 100644
--- a/spec/unit/outputs/opensearch_spec.rb
+++ b/spec/unit/outputs/opensearch_spec.rb
@@ -279,7 +279,7 @@
       let(:events) { [ ::LogStash::Event.new("foo" => "bar1"), ::LogStash::Event.new("foo" => "bar2") ] }
 
       let(:bulk_response) do
-        # shouldn't really happen but we've seen this happen - here ES returns more items than were sent
+        # shouldn't really happen but we've seen this happen - here OpenSearch returns more items than were sent
         { "took"=>1, "ingest_took"=>9, "errors"=>true,
           "items"=>[{"index"=>{"_index"=>"bar1", "_type"=>"_doc", "_id"=>nil, "status"=>500,
                               "error"=>{"type" => "illegal_state_exception",
@@ -752,7 +752,7 @@
   end
 
 
-  describe "post-register ES setup" do
+  describe "post-register OpenSearch setup" do
     let(:do_register) { false }
     let(:version) { '7.10.0' }
     let(:options) { { 'hosts' => '127.0.0.1:9999' } }
@@ -761,7 +761,7 @@
     before do
       allow(logger).to receive(:error) # expect tracking
 
-      allow(subject).to receive(:last_es_version).and_return version
+      allow(subject).to receive(:last_version).and_return version
       # make successful_connection? return true:
       allow(subject).to receive(:maximum_seen_major_version).and_return Integer(version.split('.').first)
       allow(subject).to receive(:stop_after_successful_connection_thread)
diff --git a/spec/unit/outputs/opensearch_ssl_spec.rb b/spec/unit/outputs/opensearch_ssl_spec.rb
index 71e69a1..9be7b68 100644
--- a/spec/unit/outputs/opensearch_ssl_spec.rb
+++ b/spec/unit/outputs/opensearch_ssl_spec.rb
@@ -40,7 +40,7 @@
       subject.close
     end
     
-    it "should pass the flag to the ES client" do
+    it "should pass the flag to the OpenSearch client" do
       expect(::Manticore::Client).to receive(:new) do |args|
         expect(args[:ssl]).to eq(:enabled => true, :verify => false)
       end.and_return(manticore_double)
@@ -79,7 +79,7 @@
       next LogStash::Outputs::OpenSearch.new(settings)
     end
 
-    it "should pass the keystore parameters to the ES client" do
+    it "should pass the keystore parameters to the OpenSearch client" do
       expect(::Manticore::Client).to receive(:new) do |args|
         expect(args[:ssl]).to include(:keystore => keystore_path, :keystore_password => "test")
       end.and_call_original