switch to 2.12

Signed-off-by: Sayali Gaikawad <gaiksaya@amazon.com>

docs/Building-an-OpenSearch-and-OpenSearch-Dashboards-Distribution.md

@@ -112,16 +112,20 @@ https://artifacts.opensearch.org/snapshots/core/opensearch/<version>-SNAPSHOT/op
 
 #### Latest Distributions Builds
 
-Use the `latest` keyword in the URL to obtain the latest nightly build for a given version. For example https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.2.0/latest/linux/x64/rpm/dist/opensearch/manifest.yml redirects to [build 5905](https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.2.0/5905/linux/x64/rpm/dist/opensearch/manifest.yml) at the time of writing this.
-
-The file is updated for each distribution, pltaform and architecture separately. Hence the `latest` number would vary.
+Use the `latest` keyword in the URL to obtain the latest nightly build for a given version. For example https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.12.0/latest/linux/x64/rpm/dist/opensearch/manifest.yml redirects to [build 9234](https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.12.0/9234/linux/x64/rpm/dist/opensearch/manifest.yml) at the time of writing this.
 
+The `latest` keyword is resolved to a specific build number by checking an `index.json` [file](https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.12.0/index/linux/x64/tar/index.json). This file is maintained individually for each platform, architecture and distribution. The index.json file has contents similar to
+
+```
+{"latest":"9445"}
+```
+
 The resolution logic is implemented in the [CloudFront URL rewriter](https://github.com/opensearch-project/opensearch-ci/tree/main/resources/cf-url-rewriter). 
 The TTL (time to live) is set to `5 mins` which means that the `latest` url may need up to 5 mins to get new contents after `index.json` is updated.
 
 All the artifacts accessible through the regular distribution URL can be accessed by the `latest` URL. This includes both OpenSearch Core, OpenSearch Dashboards Core and their plugins. 
 
-For example, you can download the latest .tar.gz distribution build of OpenSearch 2.2.0 directly at https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.2.0/latest/linux/x64/tar/dist/opensearch/opensearch-2.2.0-linux-x64.tar.gz, without having to first download and parse the [complete build manifest](https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.2.0/latest/linux/x64/tar/dist/opensearch/manifest.yml).
+For example, you can download the latest .tar.gz distribution build of OpenSearch 2.12.0 directly at https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.12.0/latest/linux/x64/tar/dist/opensearch/opensearch-2.12.0-linux-x64.tar.gz, without having to first download and parse the [complete build manifest](https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.12.0/latest/linux/x64/tar/dist/opensearch/manifest.yml).
 
 For plugin artifacts, you can also use the `latest` keyword to get the latest plugin artifacts with a known version. E.g. in order to get performance-analyzer x64 tarball artifacts for 2.1.0, you can obtain it with link https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.1.0/latest/linux/x64/tar/builds/opensearch/plugins/opensearch-performance-analyzer-2.1.0.0.zip, which will redirect you to https://ci.opensearch.org/ci/dbc/distribution-build-opensearch/2.1.0/5757/linux/x64/tar/builds/opensearch/plugins/opensearch-performance-analyzer-2.1.0.0.zip.