Update README.md to indicate it is archived

README.md

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+> TLDR: This Sink is archived, you can use the [Elastic.Serilog.Sink](https://www.nuget.org/packages/Elastic.Serilog.Sinks) instead. This one is supported by Elastic themselves.
+
+Longer version: This sink is archived as it became too hard to keep it maintained and up to date with the new version of Elastic. I have been [searching](https://github.com/serilog-contrib/serilog-sinks-elasticsearch/issues/486) for a maintainer for some time, but unfortunately, there was nobody who could take over the responsibilities and give it more attention than I could give it. 
+
+Luckily, Elastic has a very good .net team and they not only provided PRs and support to this sink, they also worked on their own implementation. 
+Combined with the current state of this sink (there is some legacy code, and some improvements to do as well) and the fact there is a great and supported alternative, I decided to [archive](https://github.com/serilog-contrib/serilog-sinks-elasticsearch/issues/583) this one.
+
+Feel free to fork and improve, or use the existing versions, but there won't be any updates. 
+
+I want to thank all the contributors and supporters for all the work during all those years. It has served the community well since it was first created in 2014, and has over 74M downloads on NuGet, so I'm glad to see that it was successful and helpful to other. 
+
+
+---
+
 # Serilog.Sinks.Elasticsearch [![Continuous Integration](https://github.com/serilog-contrib/serilog-sinks-elasticsearch/actions/workflows/cicd.yaml/badge.svg?branch=dev)](https://github.com/serilog-contrib/serilog-sinks-elasticsearch/actions/workflows/cicd.yaml) [![NuGet Badge](https://img.shields.io/nuget/v/Serilog.Sinks.Elasticsearch.svg)](https://www.nuget.org/packages/Serilog.Sinks.Elasticsearch)
 
 This repository contains two nuget packages: `Serilog.Sinks.Elasticsearch` and `Serilog.Formatting.Elasticsearch`.