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If the "Enable CMS Based Search" setting in Stores is checked then whenever CMS pages and Blogs and News pages will be published, indexes for the same will be generated and index details will be displayed in this section.
Administrators can also Create Indexes for CMS pages and Blogs and News pages from this section.
Stores - Admin users can select a specific store from Store Drop down to see the created index for that particular store.
Create Index - If Admin users want to create/update an index manually for any particular store then it can be created/updated using this button. The index can be created for only "preview" or "production and preview" environments
Note - When Enable CMS-based search is true then there will be two tabs displayed on the search result page of the webstore, one for pages and another one for products.
Steps to create Index
Step 1 - Select the catalog
Step 2 - Change the name of the Index (optional)
Step 3 - Click on the Create Index button
The created Indexes can be seen in the list below.