ElasticsearchJsonFormatter should set render message to true by default

[klettier]

Does this issue relate to a new feature or an existing bug?

• Bug
• New Feature

What version of Serilog.Sinks.Elasticsearch is affected? Please list the related NuGet package.

• All

What is the target framework and operating system? See target frameworks & net standard matrix.

• All

Please describe the current behavior?

When I'm calling WriteTo.Elasticsearch without providing any CustomFormatter in ElasticsearchSinkOptions it will create a formatter with property renderMessage set to true see here.

If I'm providing my own instance of ElasticsearchJsonFormatter I have to be aware of that behavior to avoid losing my message property because the default behavior is to set renderMessage to false see here

Please describe the expected behavior?

I think we should be consistent here and set renderMessage to true by default in the constructor of ElasticsearchJsonFormatter

[mivano]

Merged