[1.x] Update MAINTAINERS.md

Coming from opensearch-project/.github#121, updated MAINTAINERS.md
to match opensearch-project recommended format. Also modify this file
to include all the missing updates.

Signed-off-by: Anan Zhuang <ananzh@amazon.com>

MAINTAINERS.md

@@ -1,13 +1,27 @@
-# OpenSearch-Dashboards Maintainers
-
-## Maintainers
-| Maintainer | GitHub ID | Affiliation |
-| --------------- | --------- | ----------- |
-| Anan | [ananzh](https://github.com/ananzh) | Amazon |
-| Bishoy Boktor | [boktorbb-amzn](https://github.com/boktorbb-amzn) | Amazon |
-| Mihir Soni | [mihirsoni](https://github.com/mihirsoni) | Amazon |
-| Rocky | [kavilla](https://github.com/kavilla) | Amazon |
-| Sean Neumann | [seanneumann](https://github.com/seanneumann) | Amazon | 
-| Tommy Markley | [tmarkley](https://github.com/tmarkley) | Amazon | 
-
-[This document](https://github.com/opensearch-project/.github/blob/main/MAINTAINERS.md) explains what maintainers do, and how they should be doing it. If you're interested in contributing, see [CONTRIBUTING](CONTRIBUTING.md).
+## Overview
+
+This document contains a list of maintainers in this repo. See [opensearch-project/.github/RESPONSIBILITIES.md](https://github.com/opensearch-project/.github/blob/main/RESPONSIBILITIES.md#maintainer-responsibilities) that explains what the role of maintainer means, what maintainers do in this and other repos, and how they should be doing it. If you're interested in contributing, and becoming a maintainer, see [CONTRIBUTING](CONTRIBUTING.md).
+
+## Current Maintainers
+
+| Maintainer | GitHub ID | Affiliation |
+| ------------------------- | --------------------------------------------------- | ----------- |
+| Anan Zhuang | [ananzh](https://github.com/ananzh) | Amazon |
+| Bishoy Boktor | [boktorbb](https://github.com/boktorbb) | Amazon |
+| Mihir Soni | [mihirsoni](https://github.com/mihirsoni) | Amazon |
+| Kawika (Rocky) Avilla | [kavilla](https://github.com/kavilla) | Amazon |
+| Sean Neumann | [seanneumann](https://github.com/seanneumann) | Amazon |
+| Miki Barahmand | [AMoo-Miki](https://github.com/AMoo-Miki) | Amazon |
+| Ashwin P Chandran | [ashwin-pc](https://github.com/ashwin-pc) | Amazon |
+| Josh Romero | [joshuarrrr](https://github.com/joshuarrrr) | Amazon |
+| Abby Hu | [abbyhu2000](https://github.com/abbyhu2000) | Amazon |
+| Yan Zeng | [zengyan-amazon](https://github.com/zengyan-amazon) | Amazon |
+| Kristen Tian | [kristenTian](https://github.com/kristenTian) | Amazon |
+| Zhongnan Su | [zhongnansu](https://github.com/zhongnansu) | Amazon |
+| Manasvini B Suryanarayana | [manasvinibs](https://github.com/manasvinibs) | Amazon |
+
+## Emeritus
+
+| Maintainer | GitHub ID | Affiliation |
+| ------------- | --------------------------------------- | ----------- |
+| Tommy Markley | [tmarkley](https://github.com/tmarkley) | Amazon |