Pasting the logstash error below..
Sending Logstash's logs to /opt/logstash/logs which is now configured via log4j2.properties
[2018-05-10T13:44:50,141][INFO ][logstash.modules.scaffold] Initializing module {:module_name=>"fb_apache", :directory=>"/opt/logstash/modules/fb_apache/configuration"}
[2018-05-10T13:44:50,171][INFO ][logstash.modules.scaffold] Initializing module {:module_name=>"netflow", :directory=>"/opt/logstash/modules/netflow/configuration"}
[2018-05-10T13:44:50,984][WARN ][logstash.config.source.multilocal] Ignoring the 'pipelines.yml' file because modules or command line options are specified
[2018-05-10T13:44:51,992][INFO ][logstash.runner ] Starting Logstash {"logstash.version"=>"6.2.3"}
[2018-05-10T13:44:52,883][INFO ][logstash.agent ] Successfully started Logstash API endpoint {:port=>9600}
[2018-05-10T13:44:56,890][INFO ][logstash.pipeline ] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>2, "pipeline.batch.size"=>125, "pipeline.batch.delay"=>50}
[2018-05-10T13:44:57,697][INFO ][logstash.outputs.elasticsearch] Elasticsearch pool URLs updated {:changes=>{:removed=>[], :added=>[http://localhost:9200/]}}
[2018-05-10T13:44:57,719][INFO ][logstash.outputs.elasticsearch] Running health check to see if an Elasticsearch connection is working {:healthcheck_url=>http://localhost:9200/, :path=>"/"}
[2018-05-10T13:44:58,095][WARN ][logstash.outputs.elasticsearch] Restored connection to ES instance {:url=>"http://localhost:9200/"}
[2018-05-10T13:44:58,209][INFO ][logstash.outputs.elasticsearch] ES Output version determined {:es_version=>6}
[2018-05-10T13:44:58,219][WARN ][logstash.outputs.elasticsearch] Detected a 6.x and above cluster: the `type` event field won't be used to determine the document _type {:es_version=>6}
[2018-05-10T13:44:58,247][INFO ][logstash.outputs.elasticsearch] Using mapping template from {:path=>nil}
[2018-05-10T13:44:58,289][INFO ][logstash.outputs.elasticsearch] Attempting to install template {:manage_template=>{"template"=>"logstash-*", "version"=>60001, "settings"=>{"index.refresh_interval"=>"5s"}, "mappings"=>{"_default_"=>{"dynamic_templates"=>[{"message_field"=>{"path_match"=>"message", "match_mapping_type"=>"string", "mapping"=>{"type"=>"text", "norms"=>false}}}, {"string_fields"=>{"match"=>"*", "match_mapping_type"=>"string", "mapping"=>{"type"=>"text", "norms"=>false, "fields"=>{"keyword"=>{"type"=>"keyword", "ignore_above"=>256}}}}}], "properties"=>{"@timestamp"=>{"type"=>"date"}, "@version"=>{"type"=>"keyword"}, "geoip"=>{"dynamic"=>true, "properties"=>{"ip"=>{"type"=>"ip"}, "location"=>{"type"=>"geo_point"}, "latitude"=>{"type"=>"half_float"}, "longitude"=>{"type"=>"half_float"}}}}}}}}
[2018-05-10T13:44:58,375][INFO ][logstash.outputs.elasticsearch] New Elasticsearch output {:class=>"LogStash::Outputs::ElasticSearch", :hosts=>["//localhost:9200"]}
[2018-05-10T13:44:58,721][ERROR][logstash.pipeline ] Error registering plugin {:pipeline_id=>"main", :plugin=>"#<LogStash::FilterDelegator:0x35dcb32c @metric_events_out=org.jruby.proxy.org.logstash.instrument.metrics.counter.LongCounter$Proxy2 - name: out value:0, @metric_events_in=org.jruby.proxy.org.logstash.instrument.metrics.counter.LongCounter$Proxy2 - name: in value:0, @metric_events_time=org.jruby.proxy.org.logstash.instrument.metrics.counter.LongCounter$Proxy2 - name: duration_in_millis value:0, @id=\"60a884e5c2495a8d94bb4c36d6ed6922d91072317b8ab83fe0088b721f8bcc9b\", @klass=LogStash::Filters::Grok, @metric_events=#<LogStash::Instrument::NamespacedMetric:0x356516cc @metric=#<LogStash::Instrument::Metric:0x30307650 @collector=#<LogStash::Instrument::Collector:0x6727404b @agent=nil, @metric_store=#<LogStash::Instrument::MetricStore:0x3732ca50 @store=#<Concurrent::Map:0x00000000000fb4 entries=3 default_proc=nil>, @structured_lookup_mutex=#<Mutex:0x44b5368f>, @fast_lookup=#<Concurrent::Map:0x00000000000fb8 entries=60 default_proc=nil>>>>, @namespace_name=[:stats, :pipelines, :main, :plugins, :filters, :\"60a884e5c2495a8d94bb4c36d6ed6922d91072317b8ab83fe0088b721f8bcc9b\", :events]>, @filter=<LogStash::Filters::Grok patterns_dir=>[\"./patterns\"], match=>{\"message\"=>\"<%{DATA:log_timestamp}> <%{WORD:log_level}> <%{DATA:servername}> <%{DATA:timer}> %{OSBMESSAGE:Message}\"}, id=>\"60a884e5c2495a8d94bb4c36d6ed6922d91072317b8ab83fe0088b721f8bcc9b\", enable_metric=>true, periodic_flush=>false, patterns_files_glob=>\"*\", break_on_match=>true, named_captures_only=>true, keep_empty_captures=>false, tag_on_failure=>[\"_grokparsefailure\"], timeout_millis=>30000, tag_on_timeout=>\"_groktimeout\">>", :error=>"unmatched close parenthesis: /<(?<DATA:log_timestamp>.*?)> <(?<WORD:log_level>\\b\\w+\\b)> <(?<DATA:servername>.*?)> <(?<DATA:timer>.*?)> (?<OSBMESSAGE:Message>(<\\w.*)|<.\\w.*))/m", :thread=>"#<Thread:0x2c8935a8 run>"}
[2018-05-10T13:44:58,770][ERROR][logstash.pipeline ] Pipeline aborted due to error {:pipeline_id=>"main", :exception=>#<RegexpError: unmatched close parenthesis: /<(?<DATA:log_timestamp>.*?)> <(?<WORD:log_level>\b\w+\b)> <(?<DATA:servername>.*?)> <(?<DATA:timer>.*?)> (?<OSBMESSAGE:Message>(<\w.*)|<.\w.*))/m>, :backtrace=>["org/jruby/RubyRegexp.java:928:in `initialize'", "/opt/logstash/vendor/bundle/jruby/2.3.0/gems/jls-grok-0.11.4/lib/grok-pure.rb:127:in `compile'", "/opt/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-grok-4.0.3/lib/logstash/filters/grok.rb:281:in `block in register'", "org/jruby/RubyArray.java:1734:in `each'", "/opt/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-grok-4.0.3/lib/logstash/filters/grok.rb:275:in `block in register'", "org/jruby/RubyHash.java:1343:in `each'", "/opt/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-grok-4.0.3/lib/logstash/filters/grok.rb:270:in `register'", "/opt/logstash/logstash-core/lib/logstash/pipeline.rb:341:in `register_plugin'", "/opt/logstash/logstash-core/lib/logstash/pipeline.rb:352:in `block in register_plugins'", "org/jruby/RubyArray.java:1734:in `each'", "/opt/logstash/logstash-core/lib/logstash/pipeline.rb:352:in `register_plugins'", "/opt/logstash/logstash-core/lib/logstash/pipeline.rb:736:in `maybe_setup_out_plugins'", "/opt/logstash/logstash-core/lib/logstash/pipeline.rb:362:in `start_workers'", "/opt/logstash/logstash-core/lib/logstash/pipeline.rb:289:in `run'", "/opt/logstash/logstash-core/lib/logstash/pipeline.rb:249:in `block in start'"], :thread=>"#<Thread:0x2c8935a8 run>"}
[2018-05-10T13:44:58,841][ERROR][logstash.agent ] Failed to execute action {:id=>:main, :action_type=>LogStash::ConvergeResult::FailedAction, :message=>"Could not execute action: LogStash::PipelineAction::Create/pipeline_id:mairoot@7c2ffadaa8ba:/opt/logstash/bin#