The Product Search API sends a keyword query to retrieve results about products and other content on your site. You can apply additional filters and facets to return products and content that either include or exclude specified attributes like colors and brands. The Category Search API sends a category query to retrieve results about products within the categories that you specify.
Query length limit
For Search requests made directly from the API, the search query should be less than 300 characters in length (or 30 words). API requests above this length will raise an Error Code 414.
There is no such restriction on search requests made from the Bloomreach dashboard.
Merchandising parameters
For a full list of the supported merchandising parameters on this API, refer to the Real-time API merchandising page.