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Is it supported to reuse the same 'alias' property for multiple manage properties in the Search Schema?
Sample screenshot
If the same alias is used for different managed properties, does it mean I can search using this alias and it will return results from both managed properties?
It's supported but it mainly depends the search scope, it's recommended to use different alias to avoid any result conflict
A better solution may be to assign the crawled properties to the custom managed property and then assign that a unique alias.
