logback.xml

<configuration>
    <statusListener class="ch.qos.logback.core.status.NopStatusListener"/>

    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
            <providers>
                <logLevel/>
                <threadName/>
                <pattern>
                    <pattern>
                        {
                            "class_name": "%logger{0}"
                        }
                    </pattern>
                </pattern>
                <message/>
                <keyValuePairs/>
                <stackTrace/>
            </providers>
        </encoder>
    </appender>

    <root level="${LOG_LEVEL:-INFO}">
        <appender-ref ref="CONSOLE"/>
    </root>

    <logger name="org.apache.tika" level="INFO"/>
</configuration>