Adds elastic-transport client support where opens LS-core a way to start using newer ES ruby client.

Author: mashhurs

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 5.0.2
+  - Adds elastic-transport support [#223](https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/223)
+
 ## 5.0.1
   - Fix: prevent plugin crash when hits contain illegal structure [#218](https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/218)
     - When a hit cannot be converted to an event, the input now emits an event tagged with `_elasticsearch_input_failure` with an `[event][original]` containing a JSON-encoded string representation of the entire hit.

lib/logstash/inputs/elasticsearch.rb

@@ -13,9 +13,6 @@
 require "base64"
 
 require "elasticsearch"
-require "elasticsearch/transport/transport/http/manticore"
-require_relative "elasticsearch/patches/_elasticsearch_transport_http_manticore"
-require_relative "elasticsearch/patches/_elasticsearch_transport_connections_selector"
 
 # .Compatibility Note
 # [NOTE]
@@ -316,7 +313,7 @@ def register
     @client_options = {
       :hosts => hosts,
       :transport_options => transport_options,
-      :transport_class => ::Elasticsearch::Transport::Transport::HTTP::Manticore,
+      :transport_class => get_transport_client_class,
       :ssl => ssl_options
     }
 
@@ -642,6 +639,16 @@ def setup_query_executor
                       end
   end
 
+  def get_transport_client_class
+    require "elasticsearch/transport/transport/http/manticore"
+    require_relative "elasticsearch/patches/_elasticsearch_transport_http_manticore"
+    require_relative "elasticsearch/patches/_elasticsearch_transport_connections_selector"
+    ::Elasticsearch::Transport::Transport::HTTP::Manticore
+  rescue ::LoadError
+    require "elastic/transport/transport/http/manticore"
+    ::Elastic::Transport::Transport::HTTP::Manticore
+  end
+
   module URIOrEmptyValidator
     ##
     # @override to provide :uri_or_empty validator

logstash-input-elasticsearch.gemspec

@@ -1,13 +1,13 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-input-elasticsearch'
-  s.version         = '5.0.1'
+  s.version         = '5.0.2'
   s.licenses        = ['Apache License (2.0)']
   s.summary         = "Reads query results from an Elasticsearch cluster"
   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"
   s.authors         = ["Elastic"]
   s.email           = '[email protected]'
-  s.homepage        = "http://www.elastic.co/guide/en/logstash/current/index.html"
+  s.homepage        = "https://elastic.co/logstash"
   s.require_paths = ["lib"]
 
   # Files