[ElasticSearch] Modify config parameters to test locally deployed ES.

[alwayslove2013]

Relate solution: #344

The directory location is vectordb_bench/backend/clients/elastic_cloud/, and the one thing that needs to be changed is config.py, where I changed the dictionary key "cloud_id" to "hosts ". This will allow the user to enter the normal es uri(eg: xxx:9200).