Log4j logging config to output JSON in Logstash json_event format or to use Socket appender

indexer.config

input {
  
  log4j {
    port => 56445
    type => "log4j"
  }

}

output {
  #stdout { }

  # If your elasticsearch server is discoverable with multicast, use this:
  elasticsearch { }

}

log4j-logstash

# for production, you should probably set pattern to %c instead of %l.  
# (%l is slower.)

# output messages into a rolling log file as well as stdout
log4j.rootLogger=INFO,stdout,R,S

# stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p %d{HH:mm:ss,SSS} %m%n

# rolling log file
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.maxFileSize=20MB
log4j.appender.R.maxBackupIndex=5
log4j.appender.R.layout=org.apache.log4j.PatternLayout
# log4j.appender.R.layout.ConversionPattern=%5p [%t] %d{ISO8601} %F (line %L) %m%n
log4j.appender.R.layout.ConversionPattern={"@timestamp": "%d{yyyy-MM-dd'T'HH:mm:ss.SSSZ}", "@message": "%m", "@fields": {"priority": "%p", "logger_name": "%c", "thread": "%t"}}%n
# Edit the next line to point to your logs directory
log4j.appender.R.File=/path/to/application.log

# logging over the network. Set port and IP for your network
log4j.appender.S=org.apache.log4j.net.SocketAppender
log4j.appender.S.port=56445
log4j.appender.S.remoteHost=192.168.20.41

Hi. Have you considered using https://github.com/logstash/log4j-jsonevent-layout?