Managing Display Fields
By default, all system and custom fields are set as display field in the index. You can change that when you create a field (see Adding or Modifying Custom Fields) or at anytime as described below. This is particularly useful when you import a field set in which one or more fields are not set as display fields and you want them to be.
To manage display fields
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On the Coveo server, access the Administration Tool (see Opening the Administration Tool).
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Select Configuration > Fields.
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In the panel on the left, select the field set containing the display fields that you want to manage.
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In the page that appears:
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Select the Display Field check box for fields that you want to be able to add as a display field in a search interface or see in the index browser.
Notes:
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By default at query time, all display fields and their values are downloaded with search results. This is the only significant cost of display field. You may want to clear the Display Field check box for unused fields to minimize the search results download size.
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In the background this selection sets the IncludeInResults index property is set to true.
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Click Apply changes.
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What's Next?
Using the Interface Editor, add a display field to the result of a .NET search interface (see Adding Display Fields to Search Results With the .NET Interface Editor).
Trouble shoot field issues by inspecting their value in the index browser (see Reviewing Document Details from the Index Browser).