Unable to start logstash Pipeline - Error registering Plugin

Hi there,

I am currently using Logstash 5.5, and when I start the plugin I am encountering the following error :

[2017-09-21T14:39:25,535][ERROR][logstash.pipeline ] Error registering plugin {:plugin=>"#<LogStash::OutputDelegator:0x852d86a @namespaced_metric=#<LogStash::Instrument::NamespacedMetric:0x7f86f730 @metric=#<LogStash::Instrument::Metric:0x734937a6 @collector=#<LogStash::Instrument::Collector:0x6efe61ff @agent=nil, @metric_store=#<LogStash::Instrument::MetricStore:0x70f175c2 @store=#<Concurrent::map:0x000000000634e0 entries=2 default_proc=nil>, @structured_lookup_mutex=#Mutex:0x3886239b, @fast_lookup=#<Concurrent::map:0x000000000634e4 entries=50 default_proc=nil>>>>, @namespace_name=[:stats, :pipelines, :main, :plugins, :outputs, :"dedfbfed5c89bb7d190b704562aee8ecf4fd3d77-3"]>, @metric=#<LogStash::Instrument::NamespacedMetric:0x1f24bf05 @metric=#<LogStash::Instrument::Metric:0x734937a6 @collector=#<LogStash::Instrument::Collector:0x6efe61ff @agent=nil, @metric_store=#<LogStash::Instrument::MetricStore:0x70f175c2 @store=#<Concurrent::map:0x000000000634e0 entries=2 default_proc=nil>, @structured_lookup_mutex=#Mutex:0x3886239b, @fast_lookup=#<Concurrent::map:0x000000000634e4 entries=50 default_proc=nil>>>>, @namespace_name=[:stats, :pipelines, :main, :plugins, :outputs]>, @logger=#<LogStash::Logging::Logger:0x6d13eba6 @logger=#Java::OrgApacheLoggingLog4jCore::Logger:0x31f11743>, @strategy=#<LogStash::OutputDelegatorStrategies::Shared:0x13405e1f @output=<LogStash::Outputs::ElasticSearch hosts=>[//localhost:9200], index=>"auditTrail_9_13_2017_P1", id=>"dedfbfed5c89bb7d190b704562aee8ecf4fd3d77-3", enable_metric=>true, codec=><LogStash::Codecs::Plain id=>"plain_baa9df5b-6785-49a7-8e27-e6b0bc4bfe89", enable_metric=>true, charset=>"UTF-8">, workers=>1, manage_template=>true, template_name=>"logstash", template_overwrite=>false, idle_flush_time=>1, doc_as_upsert=>false, script_type=>"inline", script_lang=>"painless", script_var_name=>"event", scripted_upsert=>false, retry_initial_interval=>2, retry_max_interval=>64, retry_on_conflict=>1, action=>"index", ssl_certificate_verification=>true, sniffing=>false, sniffing_delay=>5, timeout=>60, pool_max=>1000, pool_max_per_route=>100, resurrect_delay=>5, validate_after_inactivity=>10000, http_compression=>false>>, @id="dedfbfed5c89bb7d190b704562aee8ecf4fd3d77-3", @metric_events=#<LogStash::Instrument::NamespacedMetric:0x7312d887 @metric=#<LogStash::Instrument::Metric:0x734937a6 @collector=#<LogStash::Instrument::Collector:0x6efe61ff @agent=nil, @metric_store=#<LogStash::Instrument::MetricStore:0x70f175c2 @store=#<Concurrent::map:0x000000000634e0 entries=2 default_proc=nil>, @structured_lookup_mutex=#Mutex:0x3886239b, @fast_lookup=#<Concurrent::map:0x000000000634e4 entries=50 default_proc=nil>>>>, @namespace_name=[:stats, :pipelines, :main, :plugins, :outputs, :"dedfbfed5c89bb7d190b704562aee8ecf4fd3d77-3", :events]>, @output_class=LogStash::Outputs::ElasticSearch>", :error=>"SSLConnectionSocketFactory not found in packages org.apache.http.client.methods, org.apache.http.client.entity, org.apache.http.client.config, org.apache.http.config, org.apache.http.conn.socket, org.apache.http.impl, org.apache.http.impl.client, org.apache.http.impl.conn, org.apache.http.impl.auth, org.apache.http.entity, org.apache.http.message, org.apache.http.params, org.apache.http.protocol, org.apache.http.auth, java.util.concurrent, org.apache.http.client.protocol, org.apache.http.conn.ssl, java.security.cert, java.security.spec, java.security, org.apache.http.client.utils; last error: cannot load Java class org.apache.http.client.utils.SSLConnectionSocketFactory"}

Has anyone come across this issue and have resolved it ?
Thanks.

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