Elastic vector limit should be 4096 instead of 2048

[filipecosta90]

From v8.10 to v8.12 the dense vector limit move from 2048 to 4096. The benchmark should adjust it accordingly in

vector-db-benchmark/engine/clients/elasticsearch/configure.py

Line 53 in 5b9bffb

if dataset.config.vector_size > 2048:

Further docs:
https://www.elastic.co/guide/en/elasticsearch/reference/current/dense-vector.html#index-vectors-knn-search

old v8.10 reference:
https://www.elastic.co/guide/en/elasticsearch/reference/8.10/dense-vector.html#dense-vector-params

new v8.12 reference:
https://www.elastic.co/guide/en/elasticsearch/reference/8.12/dense-vector.html#dense-vector-params

[KShivendu]

We need to update ES version to properly do this