public void setReturn(String returnValue) {
        this.returnValue = returnValue;
    }
<p>
Specifies the field and expression values to include in the response. Multiple fields or expressions are
specified as a comma-separated list. By default, a search response includes all return enabled fields (
<code>_all_fields</code>). To return only the document IDs for the matching documents, specify
<code>_no_fields</code>. To retrieve the relevance score calculated for each document, specify
<code>_score</code>.
</p>

@param returnValue
       Specifies the field and expression values to include in the response. Multiple fields or expressions are
       specified as a comma-separated list. By default, a search response includes all return enabled fields (
       <code>_all_fields</code>). To return only the document IDs for the matching documents, specify
       <code>_no_fields</code>. To retrieve the relevance score calculated for each document, specify
       <code>_score</code>.
aws-java-sdk-cloudsearch/src/main/java/com/amazonaws/services/cloudsearchdomain/model/SearchRequest.java