Searching with a Field Alias
Field Aliases may be available on your site when multiple fields need to be searched at one time. A good example of this may be a search all of the major fields that contain names, such as All Names (author, recipient, cc, bcc, custodian). If a Field Alias exists, you will see it at the top of the Field Name list.
Select it, and then select the Operator and Value. As always when using the Search Assist, remember to click Add to Search. The search will expand to contain all of the fields associated with the Field Alias, and the OR connector is put between each phrase.