Use the Index Properties dialog box to add or remove fields from your roster, queue, or event log index. See Manage indexes for additional information.
You can also change the order of the indexed fields for composite indexes. A composite index (also called a concatenated index) is an index that you create on multiple columns in a table. Columns in a composite index can appear in any order. Composite indexes can speed retrieval of data for search filters in which the filter conditions reference all or the leading portion of the columns in the composite index. Therefore, the order of the columns used in the definition is important; generally, the most commonly accessed or most selective columns go first.
To add or remove fields in the index
To remove fields, select one or more Selected items and click Remove.
To change the order of the indexed fields
NOTE An index must not exceed the maximum allowable size.