Add Ashish Singh as maintainer (#14567)

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>

Author: Bukhtawar

.github/CODEOWNERS

@@ -24,4 +24,4 @@
 
 /.github/ @peternied
 
-/MAINTAINERS.md @anasalkouz @andrross @Bukhtawar @CEHENKLE @dblock @dbwiddis @gbbafna @jed326 @kotwanikunal @mch2 @msfroh @nknize @owaiskazi19 @peternied @reta @Rishikesh1159 @sachinpkale @saratvemulapalli @shwetathareja @sohami @VachaShah
+/MAINTAINERS.md @anasalkouz @andrross @ashking94 @Bukhtawar @CEHENKLE @dblock @dbwiddis @gbbafna @jed326 @kotwanikunal @mch2 @msfroh @nknize @owaiskazi19 @peternied @reta @Rishikesh1159 @sachinpkale @saratvemulapalli @shwetathareja @sohami @VachaShah

MAINTAINERS.md

@@ -9,6 +9,7 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Anas Alkouz              | [anasalkouz](https://github.com/anasalkouz)             | Amazon      |
 | Andrew Ross              | [andrross](https://github.com/andrross)                 | Amazon      |
 | Andriy Redko             | [reta](https://github.com/reta)                         | Aiven       |
+| Ashish Singh             | [ashking94](https://github.com/ashking94)               | Amazon      |
 | Bukhtawar Khan           | [Bukhtawar](https://github.com/Bukhtawar)               | Amazon      |
 | Charlotte Henkle         | [CEHENKLE](https://github.com/CEHENKLE)                 | Amazon      |
 | Dan Widdis               | [dbwiddis](https://github.com/dbwiddis)                 | Amazon      |