Incremented version to 1.2.4, upgraded log4j, added release notes.#356

Merged

dblock merged 1 commit intoopensearch-project:1.2from dblock:1.2

Jan 3, 2022

+12-5

Commits on Dec 31, 2021

Upgrade to log4j 2.17.1. (opensearch-project#354 )
dblock
committed