Q:

False Positive Returned in wild card character search in Marklogic 7

I am executing an XQuery search against a word query to return values using co-occurrences.  But the problem is that while executing a wild card search, then there are certain false positives that are returned as part of the matching documents. 
The element word query executed is 
cts:element-word-query(fn:QName("", "contents"), "project monitor*", 
  ("case-insensitive","punctuation-insensitive","stemmed","lang=en"), 1)

The query which is executed is 
cts:element-value-co-occurrences(xs:QName("node1"), xs:QName("node2"),                            
  ("collation=http://marklogic.com/collation/"),
  cts:and-query((
        cts:element-word-query(fn:QName("", "node3"), "project monitor*", ("case-insensitive","punctuation-insensitive","stemmed","lang=en"), 1),
        cts:element-range-query(
            xs:QName("node4"),
            "=",
            xs:long('1234567891011')
        ),
        cts:element-attribute-range-query(
            xs:QName("node5"),  
            xs:QName("attribute1"),  
            "=",
            ""
        ),
        cts:collection-query('collection1'),
        ()    
    ))
)

It is returning two matching results, which has one positive and one has a false positive items. 
<cts:co-occurrence>
    <cts:value xsi:type="xs:string">General</cts:value>
    <cts:value xsi:type="xs:string">/pdf/text-document/12345_0_1234.xml</ct‌​s:value>
</cts:co-occurrence> 
<cts:co-occurrence>
   <cts:value xsi:type="xs:string">Other</cts:value>
   <cts:value xsi:type="xs:string">/pdf/text-doc/1234_1_0000.xml</cts:value>
</cts:co-occurrence>

A:

Without a complete reproducible test case, my best guess is that a missing positional index is causing the wildcarded cts:element-word-query to return the false positive.  Try enabling either or both: element word positions and element value positions in your database configuration and retry the query (after reindexing). 