[DOC] Fix lucene HNSW vector dimensionality.

[Devanshu24]

What do you want to do?

• Request a change to existing documentation
• Report a technical problem with the documentation

Tell us about your request. Provide a summary of the request.
From the docs,

documentation-website/_search-plugins/vector-search.md

Lines 98 to 100 in d4bbdd9

	| | NMSLIB/HNSW | Faiss/HNSW | Faiss/IVF | Lucene/HNSW |
	|:---|:---|:---|:---|:---|
	| Max dimensions | 16,000 | 16,000 | 16,000 | 1,024 |

it states the max dimension for vectors in 1,024. However, that seems outdated after this addition (opensearch-project/k-NN#1346), which is also released(https://github.com/opensearch-project/k-NN/releases/tag/2.12.0.0) in 2.12.

*Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
2.12+
What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
There was also an effort to update the documentation but I believe this page was missed

• [DOC] Update k-NN Lucene Engine Dimension Limit to 16k #5874

[hdhalter]

Thanks for reporting this, @Devanshu24! Do you want to create the PR for this fix?

Tagging @kolchfa-aws, since that page on vector search is a recent update, and @junqiu-lei, since you implemented the fix. Thanks!

[Naarcha-AWS]

Thanks for bring this to our attention @Devanshu24! I submitted PR #8051 which should resolve the issue.