You are browsing upcoming documentation for version 5.1 of OroCommerce, OroCRM, and OroPlatform, scheduled for release in March 2023. Read version 5.0 (the latest LTS version) of the Oro documentation to get up-to-date information.
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Request builder is a separate class used to build a specific part of a search request to Elasticsearch based on source Query object. Request builder must implement the \Oro\Bundle\ElasticSearchBundle\RequestBuilder\RequestBuilderInterface interface.
You can read more about the Request Builders in the developer documentation of ElasticSearchBundle.