diff --git a/.ci/logstash-run.sh b/.ci/logstash-run.sh
index d0fb854..e7e81e1 100755
--- a/.ci/logstash-run.sh
+++ b/.ci/logstash-run.sh
@@ -21,7 +21,7 @@ wait_for_es() {
 }
 
 if [[ "$INTEGRATION" != "true" ]]; then
-  bundle exec rspec -fd spec/inputs -t ~integration -t ~secure_integration
+  jruby -rbundler/setup -S rspec -fd --tag ~integration --tag ~secure_integration spec/inputs
 else
   if [[ "$SECURE_INTEGRATION" == "true" ]]; then
     extra_tag_args="--tag secure_integration"
@@ -29,5 +29,5 @@ else
     extra_tag_args="--tag ~secure_integration --tag integration"
   fi
   wait_for_es
-  bundle exec rspec -fd $extra_tag_args --tag es_version:$ELASTIC_STACK_VERSION spec/inputs/integration
+  jruby -rbundler/setup -S rspec -fd $extra_tag_args --tag es_version:$ELASTIC_STACK_VERSION spec/inputs/integration
 fi
diff --git a/.travis.yml b/.travis.yml
index a2283ac..998e838 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,10 +6,12 @@ before_install:
 
 env:
 - INTEGRATION=false ELASTIC_STACK_VERSION=7.x
+- INTEGRATION=false ELASTIC_STACK_VERSION=8.x
 - INTEGRATION=false ELASTIC_STACK_VERSION=7.x SNAPSHOT=true
 - INTEGRATION=false ELASTIC_STACK_VERSION=8.x SNAPSHOT=true
+- INTEGRATION=false ELASTIC_STACK_VERSION=7.16.3 MANTICORE_VERSION=0.7.1 ELASTICSEARCH_VERSION=7.15.0
 - INTEGRATION=true ELASTIC_STACK_VERSION=7.x
-- INTEGRATION=true ELASTIC_STACK_VERSION=7.x SNAPSHOT=true
-- INTEGRATION=true ELASTIC_STACK_VERSION=8.x SNAPSHOT=true
-- SECURE_INTEGRATION=true INTEGRATION=true ELASTIC_STACK_VERSION=7.x
-- SECURE_INTEGRATION=true INTEGRATION=true ELASTIC_STACK_VERSION=7.15.0
+- INTEGRATION=true ELASTIC_STACK_VERSION=7.x SNAPSHOT=true LOG_LEVEL=info
+- INTEGRATION=true ELASTIC_STACK_VERSION=8.x SNAPSHOT=true LOG_LEVEL=info
+- SECURE_INTEGRATION=true INTEGRATION=true ELASTIC_STACK_VERSION=7.x LOG_LEVEL=info
+- SECURE_INTEGRATION=true INTEGRATION=true ELASTIC_STACK_VERSION=7.15.0 MANTICORE_VERSION=0.7.1 ELASTICSEARCH_VERSION=7.14.1 LOG_LEVEL=info
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 693ae49..2251e18 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 4.12.2
+  - Fix: hosts => "es_host:port" regression [#168](https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/168)
+
 ## 4.12.1
   - Fixed too_long_frame_exception by passing scroll_id in the body [#159](https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/159)
 
diff --git a/Gemfile b/Gemfile
index 32cc6fb..85bf037 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,3 +9,6 @@ if Dir.exist?(logstash_path) && use_logstash_source
   gem 'logstash-core', :path => "#{logstash_path}/logstash-core"
   gem 'logstash-core-plugin-api', :path => "#{logstash_path}/logstash-core-plugin-api"
 end
+
+gem 'manticore', ENV['MANTICORE_VERSION'] if ENV['MANTICORE_VERSION']
+gem 'elasticsearch', ENV['ELASTICSEARCH_VERSION'] if ENV['ELASTICSEARCH_VERSION']
diff --git a/lib/logstash/inputs/elasticsearch.rb b/lib/logstash/inputs/elasticsearch.rb
index 851ebd7..1319d7f 100644
--- a/lib/logstash/inputs/elasticsearch.rb
+++ b/lib/logstash/inputs/elasticsearch.rb
@@ -386,13 +386,13 @@ def setup_ssl
 
   def setup_hosts
     @hosts = Array(@hosts).map { |host| host.to_s } # potential SafeURI#to_s
-    if @ssl
-      @hosts.map do |h|
-        host, port = h.split(":")
-        { :host => host, :scheme => 'https', :port => port }
+    @hosts.map do |h|
+      if h.start_with?('http:', 'https:')
+        h
+      else
+        host, port = h.split(':')
+        { host: host, port: port, scheme: (@ssl ? 'https' : 'http') }
       end
-    else
-      @hosts
     end
   end
 
diff --git a/logstash-input-elasticsearch.gemspec b/logstash-input-elasticsearch.gemspec
index 5570314..2cd5bfc 100644
--- a/logstash-input-elasticsearch.gemspec
+++ b/logstash-input-elasticsearch.gemspec
@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
 
   s.name            = 'logstash-input-elasticsearch'
-  s.version         = '4.12.1'
+  s.version         = '4.12.2'
   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"
diff --git a/spec/inputs/integration/elasticsearch_spec.rb b/spec/inputs/integration/elasticsearch_spec.rb
index e7c1132..8edc5d8 100644
--- a/spec/inputs/integration/elasticsearch_spec.rb
+++ b/spec/inputs/integration/elasticsearch_spec.rb
@@ -6,13 +6,19 @@
 
 describe LogStash::Inputs::Elasticsearch do
 
-  let(:config)   { { 'hosts' => [ESHelper.get_host_port],
+  SECURE_INTEGRATION = ENV['SECURE_INTEGRATION'].eql? 'true'
+
+  let(:config)   { { 'hosts' => ["http#{SECURE_INTEGRATION ? 's' : nil}://#{ESHelper.get_host_port}"],
                      'index' => 'logs',
                      'query' => '{ "query": { "match": { "message": "Not found"} }}' } }
   let(:plugin) { described_class.new(config) }
   let(:event)  { LogStash::Event.new({}) }
   let(:client_options) { Hash.new }
 
+  let(:user) { ENV['ELASTIC_USER'] || 'simpleuser' }
+  let(:password) { ENV['ELASTIC_PASSWORD'] || 'abc123' }
+  let(:ca_file) { "spec/fixtures/test_certs/ca.crt" }
+
   before(:each) do
     @es = ESHelper.get_client(client_options)
     # Delete all templates first.
@@ -45,7 +51,7 @@
     end
   end
 
-  describe 'against an unsecured elasticsearch', :integration => true do
+  describe 'against an unsecured elasticsearch', integration: true do
     before(:each) do
       plugin.register
     end
@@ -53,10 +59,7 @@
     it_behaves_like 'an elasticsearch index plugin'
   end
 
-  describe 'against a secured elasticsearch', :secure_integration => true do
-    let(:user) { ENV['ELASTIC_USER'] || 'simpleuser' }
-    let(:password) { ENV['ELASTIC_PASSWORD'] || 'abc123' }
-    let(:ca_file) { "spec/fixtures/test_certs/ca.crt" }
+  describe 'against a secured elasticsearch', secure_integration: true do
 
     let(:client_options) { { :ca_file => ca_file, :user => user, :password => password } }
 
@@ -78,4 +81,28 @@
     end
 
   end
+
+  context 'setting host:port', integration: true do
+
+    let(:config) do
+      super().merge "hosts" => [ESHelper.get_host_port]
+    end
+
+    it_behaves_like 'an elasticsearch index plugin'
+
+  end
+
+  context 'setting host:port (and ssl)', secure_integration: true do
+
+    let(:client_options) { { :ca_file => ca_file, :user => user, :password => password } }
+
+    let(:config) do
+      config = super().merge "hosts" => [ESHelper.get_host_port]
+      config.merge('user' => user, 'password' => password, 'ssl' => true, 'ca_file' => ca_file)
+    end
+
+    it_behaves_like 'an elasticsearch index plugin'
+
+  end
+
 end