[BUG] No Fallback mechanism

[amitdixit]

If for some reason we are not able to log may be due to connection issue or any other problem there should be a Fallback as wit is available in Serilog.Sinks.Elasticsearch. Since you Elastic team is encouraging to use their sink then it should have atleast basic features.

There should be a reconnect/retry mechanism.

ECS integration/library project(s) (e.g. Elastic.CommonSchema.Serilog):

ECS schema version (e.g. 1.4.0):

ECS .NET assembly version (e.g. 1.4.2):

Elasticsearch version (if applicable):

.NET framework / OS:

Description of the problem, including expected versus actual behavior:

Steps to reproduce: 1. 2. 3.