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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. According to this interface, the builder receives Query object and the existing request array. The builder returns modified request array.
There are four default request builders.
Builder gets the from part of a query and converts any specific entities into the required indexes. See index types for more information.
Builder iterates through all conditions in the where part of the query and passes them to the chain of part builders that are used to process specific condition operators.
EqualsWherePartBuilder - processes = (equals) and != (not equals) operators. Adds a term query.
RangeWherePartBuilder - processes arithmetical operators applied to numeric values: > (greater), >= (greater or equals), < (lower) and <= (lower or equals ). Adds appropriate range query.
InWherePartBuilder - processes in and !in operators. Converts the set into several = or != conditions that uses term query.
Each part builder receives field name, field type, condition operator, value, boolean keyword and source request and returns the altered request.
Builder gets the order-by field and the order direction from the query. If they are defined, builder converts them to the sort parameter of a search request. The result is sorted by relevance by default.
Builder gets first result and max results values from the query and if they are defined they are converted into the from/size pagination parameters of a search request.
Builder gets collection of aggregating function and field name from the query. If they are defined they are converted into the aggregations parameters of a search request. Built structure of aggregations parameters will have bucket type of aggregations, where each bucket is associated with a field name and a document criterion.