fix: SearchEngine had num index == num replicas

[gabrielmbmb]

Description

When the instance of SearchEngine was created we were passing the value of the attribute settings.es_records_index_shards to both es_number_of_shards and es_number_of_replicas arguments. This PR fix that and now value of attribute settings.es_records_index_shards is passed to es_number_of_replicas argument.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested

In a local development environment:

• Run the Argilla server without the fix and create a FeedbackDataset. When calling GET localhost:9200/_cat/shards?v, two shards are listed for the dataset (one primary started and one replica unassigned)
• Run the Argilla with the fix and create a FeedbackDataset. When calling GET localhost:9200/_cat/shards?v, only one primary shard is listed for the dataset

Checklist

• I followed the style guidelines of this project
• I did a self-review of my code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I filled out the contributor form (see text above)
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[github-actions]

The URL of the deployed environment for this PR is https://argilla-quickstart-pr-3736-ki24f765kq-no.a.run.app