When to reindex your content?

When making changes in “Search Schema” of your SharePoint environment you sometimes need to restart the crawler to properly index the changes.

When to reindex your content?

Found a nice overview in this article:
http://technet.microsoft.com/en-us/library/jj219667(v=office.15).aspx

Managed property setting Action Requires a full crawl to reindex
Mapping a crawled to a managed property Add/Delete mapping Yes
Token normalization Enable/Disable Yes
Complete matching Enable/Disable Yes
Company name extraction Enable/Disable Yes
Custom entity extraction Enable/Disable Yes
Searchable Enable/Disable Yes
Queryable Enable Yes
Queryable Disable No
Retrievable Enable Yes
Retrievable Disable No
Refinable Enable (if not already Sortable) Yes
Refinable Disable No
Sortable Enable (if not already Refinable) Yes
Sortable Disable No
Alias Add/Delete No

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