Hi Team Below are the error that I am getting

Error registering plugin {:pipeline_id=>"main", :plugin=>"#<LogStash::FilterDelegator:0x622f012e @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=\"950af9e45367a48d0d80d2016dabb2c00b6443c6da22ed5b72a3a2d31dcef7a6\", @klass=LogStash::Filters::Grok, @metric_events=#<LogStash::Instrument::NamespacedMetric:0x240caa68>, @filter=<LogStash::Filters::Grok match=>{\"message\"=>\"^# User@Host: %{USER:mysql_user}(?:\\\\[[^\\\\]]+\\\\])?\\\\s+@\\\\s+%{HOST:mysql_client_host}?\\\\s+\\\\[%{IP:mysql_client_ip}?\\\\]\"}, id=>\"950af9e45367a48d0d80d2016dabb2c00b6443c6da22ed5b72a3a2d31dcef7a6\", 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=>"pattern %{HOST:mysql_client_host} not defined", :thread=>"#<Thread:0x3f9ab6d@/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:156 run>"}

2019-04-15T08:49:06,459][ERROR][logstash.pipeline        ] Pipeline aborted due to error {:pipeline_id=>"main", :exception=>#<Grok::PatternError: pattern %{HOST:mysql_client_host} not defined>, :backtrace=>["/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/jls-grok-0.11.5/lib/grok-pure.rb:123:in `block in compile'", "org/jruby/RubyKernel.java:1292:in `loop'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/jls-grok-0.11.5/lib/grok-pure.rb:93:in `compile'", "/usr/share/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'", "/usr/share/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'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-grok-4.0.3/lib/logstash/filters/grok.rb:270:in `register'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:241:in `register_plugin'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:252:in `block in register_plugins'", "org/jruby/RubyArray.java:1734:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:252:in `register_plugins'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:594:in `maybe_setup_out_plugins'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:262:in `start_workers'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:199:in `run'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:159:in `block in start'"], :thread=>"#<Thread:0x3f9ab6d@/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:156 run>"}
[2019-04-15T08:49:06,468][ERROR][logstash.agent           ] Failed to execute action {:id=>:main, :action_type=>LogStash::ConvergeResult::FailedAction, :message=>"

And this is my conf file.
filter{
if [type] == "rds" {
    grok {
    match => [ "message", "^# User@Host: %{USER:mysql_user}(?:\[[^\]]+\])?\s+@\s+%{HOST:mysql_client_host}?\s+\[%{IP:mysql_client_ip}?\]"]
  }
    grok {
    match => [ "message", "^# Query_time: %{NUMBER:query_duration_s:float}\s+Lock_time: %{NUMBER:lock_wait_s:float} Rows_sent: %{NUMBER:query_sent_rows:int} \s*Rows_examined: %{NUMBER:query_examined_rows:int}"]
  }
    grok {
    match => [ "message", "^SET timestamp=%{NUMBER:timestamp};" ]
  }
    grok {
    match => {
      "message" => [
        "^FROM %{NOTSPACE:query_table}",
        "^UPDATE %{NOTSPACE:query_table}.*",
        "^INSERT INTO %{NOTSPACE:query_table}.*",
        "^DELETE FROM %{NOTSPACE:query_table}.*"
      ]
    }
  }
        mutate {
             add_field => {
                            "[@metadata][indexname]" => "rds-logs"
                     }
          }
     }
}