Have logstash-logback-encoder send logs directly to elasticsearch backend

[patpatpat123]

Is your feature request related to a problem? Please describe.
This project is amazing.
With simple configuration, like this one below, one can very easily forward logs to logstash, and have logstash forward the logs to elasticsearch.

<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="true">

    <springProperty scope="context" name="name" source="spring.application.name"/>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss} ${PID} %-5level --- [%thread] [${name},%X{traceId:-},%X{spanId:-}] %logger{36} : %msg%n
            </pattern>
        </encoder>
    </appender>

    <appender name="LOGSTASH" class="net.logstash.logback.appender.LogstashTcpSocketAppender">
        <encoder class="net.logstash.logback.encoder.LogstashEncoder"/>
        <destination>mylogstash:5555</destination>
    </appender>

    <root level="INFO">
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="LOGSTASH"/>
    </root>

</configuration>

Unfortunately, this requires to spin up and maintain an entire logstash instance, just for the sake of forwarding those logs.

Describe the solution you'd like

it would be great if this project can send to elasticsearch directly, something like

    <appender name="LOGSTASH" class="net.logstash.logback.appender.LogstashTcpSocketAppender">
        <encoder class="net.logstash.logback.encoder.LogstashEncoder"/>
        <destination>myelasticsearch:9092/thelogindex</destination>
    </appender>

This would make this project even more awesome

Thank you for your consideration