Hibernate xml property placeholder for lucene index field

I'm pretty new to Hibernate and to XML so I'm sorry if this is a silly question.

I am editing code and am working with the following .hbm.xml file:

<id name="caseId" column="CallID">
  <generator class="native"/>
</id>
<property name="IssueTitle" column="CallSubject">
    <type name="jcolibri.connector.databaseutils.GenericUserType">
        <param name="className">jcolibri.datatypes.Text</param>
    </type>
</property>
<property name="IssueDescription" column="CallDesc">
    <type name="jcolibri.connector.databaseutils.GenericUserType">
        <param name="className">jcolibri.datatypes.Text</param>
    </type>
</property>

and here is the associated Java class:

package test.db1;

import core.Attribute;
import datatypes.Text;

public class dbDescription implements core.CaseComponent 
{
    String caseId;
    Text issueTitle, issueDescription, issueIndexDescription;

    public String getCaseId() 
    {
        return caseId;
    }

    public void setCaseId(String caseId) 
    {
        this.caseId = caseId;
    }

    public Text getIssueTitle()
    {
        return issueTitle;
    }

    public void setIssueTitle(Text issueTitle)
    {
        this.issueTitle = issueTitle;
    }

    public Text getIssueDescription()
    {
        return issueDescription;
    }

    public void setIssueDescription(Text issueDescription)
    {
        this.issueDescription = issueDescription;
    }

    public Attribute getIdAttribute() 
    {
        return new Attribute("caseId", this.getClass());
    }

    public Text getIssueIndexDescription()
    {
        return issueIndexDescription;
    }

    public void setIssueIndexDescription(Text issueIndexDescription)
    {
        this.issueIndexDescription = issueIndexDescription;
    }
}

I have a Lucene index that's also being read in from the file system and I want to store its values in the issueIndexDescription variable. Is it possible to set up another property in the Hibernate file that doesn't link up to a column so that it's there as a placeholder? I want to be able to tell the program that the property exists and give it a type but not actually populate it. Or am I going about this the totally wrong way?