Adding Emeritus Maintainers (#3933)

Signed-off-by: Jeff Lu <[email protected]>

MAINTAINERS.md

@@ -1,5 +1,6 @@
 - [Overview](#overview)
 - [Current Maintainers](#current-maintainers)
+- [Emeritus Maintainers](#Emeritus-maintainers)
 - [Release Owner](#release-owner)
   - [Release Activities](#release-activities)
   - [Dealing with Ambiguity](#dealing-with-ambiguity)
@@ -38,6 +39,15 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Daniel (dB.) Doubrovkine  | [dblock](https://github.com/dblock)      | Amazon      |
 | Tianle Huang | [tianleh](https://github.com/tianleh)    | Amazon      |
 
+## Emeritus Maintainers
+
+| Maintainer        | GitHub ID                                               | Affiliation |
+| ----------------- | ------------------------------------------------------- | ----------- |
+| Abhinav Gupta     | [abhinavGupta16](https://github.com/abhinavGupta16)     | Amazon      |
+| Cameron Skinner   | [camerski](https://github.com/camerski)                 | Amazon      |
+| Marc Handalian    | [mch2](https://github.com/mch2)                         | Amazon      |
+| Peter Nied        | [peternied](https://github.com/peternied)               | Amazon      |
+
 ## Release Owner
 
 The release owner is a temporary role for the duration of a given OpenSearch / OpenSearch Dashboards release.  This owner is tracked by the assignment of a release ticket an individual. The release owner oversees the release ticket, makes sure the activities are completed, and closed the release.  Release activities are documented in the release ticket, see the [template](./.github/ISSUE_TEMPLATE/release_template.md). The purpose of the release owner is to be responsible for following the release process.