log4net testing

app.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
    </configSections>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
    </startup>
    <log4net>
        <appender name="ElasticSearchAppender" type="log4net.ElasticSearch.ElasticSearchAppender, log4net.ElasticSearch">
            <layout type="log4net.Layout.PatternLayout,log4net">
                <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p %c{1}:%L - %m%n" />
            </layout>
            <connectionString value="Server=localhost;Index=log;Port=9200;rolling=true"/>
            <lossy value="false" />
            <bufferSize value="100" />
            <evaluator type="log4net.Core.LevelEvaluator">
                <threshold value="ALL"/>
            </evaluator>
        </appender>
        <root>
            <level value="ALL"/>
            <appender-ref ref="ElasticSearchAppender" />
        </root>
    </log4net>
    <appSettings>
        <add key="log4net.Internal.Debug" value="true"/>
    </appSettings>

    <system.diagnostics>
        <trace autoflush="true">
            <listeners>
                <add
                    name="textWriterTraceListener"
                    type="System.Diagnostics.TextWriterTraceListener"
                    initializeData="C:\temp\log4net.txt" />
            </listeners>
        </trace>
    </system.diagnostics>

</configuration>

Program.cs

class Program
    {
        private static readonly ILog _log = LogManager.GetLogger(typeof(Program));
        static void Main(string[] args)
        {
            try
            {
                var z = decimal.Divide(10, 0);
            }
            catch (Exception ex)
            {
                _log.Error(ex);
            }
        }
    }