Move maintainer kartg to Emeritus (#12550)

Also includes removal from CODEOWNERS

Signed-off-by: Kartik Ganesh <gkart@amazon.com>

Author: kartg

.github/CODEOWNERS

@@ -11,7 +11,7 @@
 #   3. Use the command palette to run the CODEOWNERS: Show owners of current file command, which will display all code owners for the current file.
 
 # Default ownership for all repo files
-* @abbashus @adnapibar @anasalkouz @andrross @Bukhtawar @CEHENKLE @dblock @dbwiddis @dreamer-89 @gbbafna @kartg @kotwanikunal @mch2 @msfroh @nknize @owaiskazi19 @reta @Rishikesh1159 @ryanbogan @sachinpkale @saratvemulapalli @setiah @shwetathareja @sohami @tlfeng @VachaShah
+* @abbashus @adnapibar @anasalkouz @andrross @Bukhtawar @CEHENKLE @dblock @dbwiddis @dreamer-89 @gbbafna @kotwanikunal @mch2 @msfroh @nknize @owaiskazi19 @reta @Rishikesh1159 @ryanbogan @sachinpkale @saratvemulapalli @setiah @shwetathareja @sohami @tlfeng @VachaShah
 
 /modules/transport-netty4/ @peternied
 
@@ -24,4 +24,4 @@
 
 /.github/ @peternied
 
-/MAINTAINERS.md @abbashus @adnapibar @anasalkouz @andrross @Bukhtawar @CEHENKLE @dblock @dbwiddis @dreamer-89 @gbbafna @kartg @kotwanikunal @mch2 @msfroh @nknize @owaiskazi19 @peternied @reta @Rishikesh1159 @ryanbogan @sachinpkale @saratvemulapalli @setiah @shwetathareja @sohami @tlfeng @VachaShah
+/MAINTAINERS.md @abbashus @adnapibar @anasalkouz @andrross @Bukhtawar @CEHENKLE @dblock @dbwiddis @dreamer-89 @gbbafna @kotwanikunal @mch2 @msfroh @nknize @owaiskazi19 @peternied @reta @Rishikesh1159 @ryanbogan @sachinpkale @saratvemulapalli @setiah @shwetathareja @sohami @tlfeng @VachaShah

MAINTAINERS.md

@@ -16,7 +16,6 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Daniel "dB." Doubrovkine | [dblock](https://github.com/dblock)                     | Amazon      |
 | Gaurav Bafna             | [gbbafna](https://github.com/gbbafna)                   | Amazon      |
 | Himanshu Setia           | [setiah](https://github.com/setiah)                     | Amazon      |
-| Kartik Ganesh            | [kartg](https://github.com/kartg)                       | Amazon      |
 | Kunal Kotwani            | [kotwanikunal](https://github.com/kotwanikunal)         | Amazon      |
 | Marc Handalian           | [mch2](https://github.com/mch2)                         | Amazon      |
 | Michael Froh             | [msfroh](https://github.com/msfroh)                     | Amazon      |
@@ -40,3 +39,4 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 |-------------------------|---------------------------------------------|-------------|
 | Megha Sai Kavikondala   | [meghasaik](https://github.com/meghasaik)   | Amazon      |
 | Xue Zhou                | [xuezhou25](https://github.com/xuezhou25)   | Amazon      |
+| Kartik Ganesh           | [kartg](https://github.com/kartg)           | Amazon      |