Add min attribute to elasticsearch form

What does this MR do and why?

Related Issue: #245219 (closed)

The elasticsearch settings form allows users to select negative values. The corresponding model IndexSetting has the necessary validations for number_of_replicas and number_of_shard attributes.

class IndexSetting < ApplicationRecord
    self.table_name = 'elastic_index_settings'

    validates :alias_name, uniqueness: true, length: { maximum: 255 }
    validates :number_of_replicas, presence: true, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
    validates :number_of_shards, presence: true, numericality: { only_integer: true, greater_than: 0 }

In the _elasticsearch_form.html.haml file, the number_field helper doesn't have the min attribute.

This MR adds a minor change to the _elasticsearch_form.html.haml file to set the min attribute for number_of_replicas and number_of_shard settings.

Screenshots or screen recordings

Before:

After:

How to set up and validate locally

1. Switch to sshaik-elasticreplicas branch
2. Once the app is up and running, navigate to https://gitlab.example.com/admin/application_settings/advanced_search (Please not that it's a paid feature)
3. Expand the Advanced Search section and change/test the values under Number of Elasticsearch shards and replicas per index

MR acceptance checklist

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