As the name indicates it, Elasticsearch Helper is a helper module to work with Elasticsearch on Drupal project.
Whereas modules like elasticsearch_connector and other search_api plugins try to abstract away the actual API of Elasticsearch, this module tries to embrace it instead. It provides some common tools on which to build your own integration.
The module defines an "ElasticsearchIndex" plugin type and a base implementation for you to extend. Unless you define your own plugin, this module will not do anything.