Sector Index A-Z can be used to search (as well as list) content in an alphabetical index - either by the title of a content node, or by an assigned topic.
The Sector A-Z (by Title) view is a Search API apple view run from a full-text Search API index. Sector A-Z (by Topic) is a Drupal content view and uses double grouping to list the topics A-Z, followed by all the nodes that are assigned to the topic.
This sample content is a node of the content type Index assigned to topics E and O.
The Sector Index documentation on sector.nz introduces the main features and functionality, and provides links and help for sitebuilders to customise Sector Index A-Z for their needs