In the world of search, the term fields refers to the various components or elements which form the schema of a document in a search engine index. Different document types have different fields. For example, a news article schema may be broken into the following fields: title, author, publication date, and content. By comparison, a product listing will likely be divided by different fields, such as title, price, SKU, thumbnail, product rating, and description.
By default, Swiftype's web crawler collects website information in the following fields: title (from the page's <title> tag), body (from the page's content), and sections (from the page's <h1> to <h6> tags). These fields can be customized or entirely reconfigured using Swiftype's custom meta tags, which are placed in the <head> of a webpage at the template level of your website. API based Swiftype engines are structured according to the design its user specifies. For information on API based schema design, see the Swiftype Search Engine Schema Design tutorial.