Revert "Use manticore client" because es-ruby supports it poorly

Unfortunately the es-ruby client doesn't support its manticore adapter
well, namely in setting content-type, so this reverts that.

This reverts commit 611e74c.

CHANGELOG.md

@@ -1,7 +1,3 @@
-## 4.0.1
-  - Switch internal HTTP client to support TLSv1.2
-  - Upgrade ES client internally to better support ES 5.x
-
 ## 4.0.0
   - Remove `scan` from list of options as this is no longer allowed in
     Elasticsearch 5.0.

lib/logstash/inputs/elasticsearch.rb

@@ -1,8 +1,6 @@
 # encoding: utf-8
 require "logstash/inputs/base"
 require "logstash/namespace"
-require 'elasticsearch'
-require 'elasticsearch/transport/transport/http/manticore'
 require "base64"
 
 # Read from an Elasticsearch cluster, based on search query results.
@@ -107,6 +105,8 @@ class LogStash::Inputs::Elasticsearch < LogStash::Inputs::Base
   config :ca_file, :validate => :path
 
   def register
+    require "elasticsearch"
+
     @options = {
       :index => @index,
       :body => @query,
@@ -117,10 +117,8 @@ def register
     transport_options = {}
 
     if @user && @password
-      transport_options[:auth] = {
-        :user => @user,
-        :password => @password.value
-      }
+      token = Base64.strict_encode64("#{@user}:#{@password.value}")
+      transport_options[:headers] = { :Authorization => "Basic #{token}" }
     end
 
     hosts = if @ssl then
@@ -132,17 +130,11 @@ def register
       @hosts
     end
 
-    client_options = {
-      :hosts => hosts, 
-      :transport_options => transport_options, 
-      :transport_class => Elasticsearch::Transport::Transport::HTTP::Manticore
-    }
-
     if @ssl && @ca_file
-      client_options[:ssl] = { :enabled => true, :ca_file => @ca_file }
+      transport_options[:ssl] = { :ca_file => @ca_file }
     end
-    
-    @client = Elasticsearch::Client.new(client_options)
+
+    @client = Elasticsearch::Client.new(:hosts => hosts, :transport_options => transport_options)
   end
 
   def run(output_queue)

logstash-input-elasticsearch.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-input-elasticsearch'
-  s.version         = '4.0.1'
+  s.version         = '4.0.0'
   s.licenses        = ['Apache License (2.0)']
   s.summary         = "Read from an Elasticsearch cluster, based on search query results"
   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"
@@ -22,9 +22,7 @@ Gem::Specification.new do |s|
   # Gem dependencies
   s.add_runtime_dependency "logstash-core-plugin-api", ">= 1.60", "<= 2.99"
 
-  s.add_runtime_dependency 'elasticsearch', ['>= 5.0.0', '< 6.0.0']
-  s.add_runtime_dependency "manticore", '>= 0.5.4', '< 1.0.0'
-
+  s.add_runtime_dependency 'elasticsearch', ['>= 1.0.6', '~> 1.0']
 
   s.add_runtime_dependency 'logstash-codec-json'