old data in cfsearch dump

I have a cfsearch that is displaying  a record that was deleted from the database weeks ago.  I have run the code below and the record keeps coming up.  What am I doing wrong?  Here's the code:

<cfquery name="getstudents" datasource="myDatasource">

SELECT ID, fname, lname, fullName

FROM student

</cfquery>

<cfindex query="getstudents"

     collection="myCollection"

     action="update"

     type="custom"

     key="ID"

     title="fullName"

     body="fname, lname, fullName">

<cfsearch

     collection="myCollection"

     name="getStudents2"

     criteria="smith"

     maxrows = "100">                         

cfdump of getstudents returns the records with one instance of smith

cfdump of getstudents2 returns the records with two instances of smith - one of which has been deleted from the database