diff --git a/README.md b/README.md
index 34f7bdb..bcbbc9f 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@ Please note that the name of the plugin when used is `clickhouse`, it only suppo
 * `automatic_retries` (default: 1) - number of connect retry attempts to each host in `http_hosts`
 * `request_tolerance` (default: 5) - number of http request send retry attempts if response status code is not 200
 * `backoff_time` (default: 3) - time to wait in seconds for next retry attempt of connect or request
+* `skip_unknown` (0 or 1, default: 1) - skip unknown fields when inserting into clickhouse. Uses `--input_format_skip_unknown_fields` parameter
 
 Default batch size is 50, with a wait of at most 5 seconds per send. These can be tweaked with the parameters `flush_size` and `idle_flush_time` respectively.
 
@@ -39,3 +40,4 @@ To build the gem yourself, use `gem build logstash-output-clickhouse.gemspec` in
 
 To install, run the following command, assuming the gem is in the local directory: `$LOGSTASH_HOME/bin/plugin install logstash-output-clickhouse-X.Y.Z.gem`
 
+P.S. Tested on Logstash 7.1.1
diff --git a/lib/logstash/outputs/clickhouse.rb b/lib/logstash/outputs/clickhouse.rb
index ea675e2..6b872c4 100644
--- a/lib/logstash/outputs/clickhouse.rb
+++ b/lib/logstash/outputs/clickhouse.rb
@@ -21,6 +21,8 @@ class LogStash::Outputs::ClickHouse < LogStash::Outputs::Base
 
   config :table, :validate => :string, :required => true
   
+  config :skip_unknown, :validate => :number, :default => 1, :inclusion => 0..1
+  
   # Custom headers to use
   # format is `headers => ["X-My-Header", "%{host}"]`
   config :headers, :validate => :hash
@@ -73,7 +75,7 @@ def register
     @request_tokens = SizedQueue.new(@pool_max)
     @pool_max.times {|t| @request_tokens << true }
     @requests = Array.new
-    @http_query = "/?query=INSERT%20INTO%20#{table}%20FORMAT%20JSONEachRow"
+    @http_query = "/?input_format_skip_unknown_fields=#{skip_unknown}&query=INSERT%20INTO%20#{table}%20FORMAT%20JSONEachRow"
 
     @hostnames_pool =
       parse_http_hosts(http_hosts,
@@ -126,32 +128,12 @@ def receive(event)
     buffer_receive(event)
   end
 
-  def mutate( src )
-    res = {}
-    @mutations.each_pair do |dstkey, source|
-      case source
-        when String then
-          scrkey = source
-          next unless src.key?(scrkey)
-
-          res[dstkey] = src[scrkey]
-        when Array then
-          scrkey = source[0]
-          next unless src.key?(scrkey)
-          pattern = source[1]
-          replace = source[2]
-          res[dstkey] = src[scrkey].sub( Regexp.new(pattern), replace )
-      end
-    end
-    res
-  end
-
   public
   def flush(events, close=false)
     documents = ""  #this is the string of hashes that we push to Fusion as documents
 
     events.each do |event|
-        documents << LogStash::Json.dump( mutate( event.to_hash() ) ) << "\n"
+        documents << LogStash::Json.dump( event ) << "\n"
     end
 
     hosts = get_host_addresses()
diff --git a/logstash-output-clickhouse.gemspec b/logstash-output-clickhouse.gemspec
index fdb1be9..ea397d6 100644
--- a/logstash-output-clickhouse.gemspec
+++ b/logstash-output-clickhouse.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
 
   # Gem dependencies
   s.add_runtime_dependency "logstash-core-plugin-api", ">= 1.60", "<= 2.99"
-  s.add_runtime_dependency "logstash-mixin-http_client", ">= 6.0.0", "<= 7.0.0"
+  s.add_runtime_dependency "logstash-mixin-http_client", ">= 6.0.0", "< 9.0.0"
   s.add_runtime_dependency 'mini_cache', ">= 1.0.0", "< 2.0.0"
 
   s.add_development_dependency 'logstash-devutils'