Primary and Secondary title and description fields
Advanced Options -> Content

During the search post-process, the plugin parses the Post/Page/CPT titles and the contents, as defined by these fields. First it looks for the Primary field, and if it is not found or empty, it uses the Secondary field.
Examples
Custom field content as Title or Description
It is possible to define a single, text based custom field as the title or description field.

Yoast SEO title and meta description custom fields
The Yoast SEO plugin uses the folling custom fields to store the custom title and meta desctiption fields:
_yoast_wpseo_title
_yoast_wpseo_metadesc
All in one SEO plugin meta title and desctiption custom fields
The All in One SEO plugin uses the following custom fields:
_aioseop_title
_aioseop_description
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