Analysis / Query problem

I have the following custom field defined for author names. 
 After indexing the 2 documents below the admin analysis
tool looks right for field-name=au and field-value=Schröder,
Jürgen   The highlight matching also seems right.  However,
if I search for au:Schröder, Jürgen using the admin tool I
do not get any hits (see below).  This appears to be the
case whenever there are 2 non-ascii characters in the author
name.  Searching for au:Schröder, Jurgen finds both of these
records.  Any idea what is causing this?

 

Thanks!

harry

 

<fieldtype name="textNoStem"
class="solr.TextField"
positionIncrementGap="100">
      <analyzer>
        <tokenizer
class="solr.WhitespaceTokenizerFactory"/> 
        <filter class="solr.StopFilterFactory"
ignoreCase="true"
words="stopwords.txt"/>
        <filter
class="solr.WordDelimiterFilterFactory"
generateWordParts="1"
generateNumberParts="1"
catenateWords="0" catenateNumbers="0"
catenateAll="0"/> 
        <filter
class="solr.LowerCaseFilterFactory"/>
        <filter
class="solr.RemoveDuplicatesTokenFilterFactory"/&g
t;
      </analyzer>
    </fieldtype>    


   <field name="au" type="textNoStem"
indexed="true" stored="true"/>       
<!-- author -->

<doc>
  <field name="no">008053223</field> 
  <field name="au">Schröder,
Jürgen,</field>
  <field name="ti">Gottfried Benn : Poesie
u. Sozialisation /</field>
  <field name="f500a">Includes
index.</field> 
  <field name="pn">Benn,
Gottfried,.</field>
  <field name="tt">Authors, German--20th
century--Biography.</field>
  <field name="dd">831.912</field> 
  <field name="s1">8</field>
  <field name="s2">83</field>
  <field name="s3">831</field>
  <field name="aud">Special</field> 
  <field name="hold">137</field>
  <field
name="swid">008053223</field>
  <field name="swkey">schroder,
jurgen$1935/gottfried benn poesie u
sozialisation</field> 
  <field name="edt">1</field>
  <field name="fmt1">01</field>
  <field name="fmt2">Book</field>
  <field name="ln">ger</field> 
  <field
name="yr">1978-12-31T23:59:59Z</field>
  <field name="nb">317004446X</field>
  <field
name="nb">9783170044463</field>
</doc>
<doc>
  <field name="no">000000001</field>
  <field name="au">Schröder,
Jurgen,</field>
  <field name="ti">Gottfried Benn : Poesie
u. Sozialisation /</field> 
  <field name="f500a">Includes
index.</field>
  <field name="pn">Benn,
Gottfried,.</field>
  <field name="tt">Authors, German--20th
century--Biography.</field> 
  <field name="dd">831.912</field>
  <field name="s1">8</field>
  <field name="s2">83</field>
  <field name="s3">831</field> 
  <field name="aud">Special</field>
  <field name="hold">137</field>
  <field
name="swid">008053223</field>
  <field name="swkey">schroder,
jurgen$1935/gottfried benn poesie u
sozialisation</field> 
  <field name="edt">1</field>
  <field name="fmt1">01</field>
  <field name="fmt2">Book</field>
  <field name="ln">ger</field> 
  <field
name="yr">1978-12-31T23:59:59Z</field>
  <field name="nb">317004446X</field>
  <field
name="nb">9783170044463</field>
</doc>

 

 

<response>

<lst name="responseHeader">

<int name="status">0</int>

<int name="QTime">0</int>

            <lst name="params">

<str name="indent">on</str>

<str name="start">0</str>

<str name="q">au:Schröder,
Jürgen</str>

<str name="rows">10</str>

<str name="version">2.2</str>

</lst>

</lst>

<result name="response" numFound="0"
start="0"/>

</response>