Configuring Solr to control the search results in Enterprise 10

Do this by disabling (commenting-out) the WordDelimiterFilterFactory class in the schema.xml by wrapping the filter elements between <!- - and - -> brackets as follows:

Step 1. Open the file <Solr installation directory>/schema.xml.

Step 2. Disable (comment-out) the WordDelimiterFilterFactory class.

<fieldType name="textNGram" class="solr.TextField" positionIncrementGap="100">
 <analyzer type="index">
  <tokenizer class="solr.WhitespaceTokenizerFactory"/>
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" />
<!-- 
   <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="1" catenateNumbers="1" catenateAll="1" splitOnCaseChange="0" splitOnNumerics="0"/>
-->
  <filter class="solr.LowerCaseFilterFactory"/>       
  <filter class="solr.NGramFilterFactory" minGramSize="4" maxGramSize="15"/>
  <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
 </analyzer>

 <analyzer type="query">
  <tokenizer class="solr.WhitespaceTokenizerFactory"/>
  <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="true"/>
  <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt"/>
<!-- 
  <filter class="solr.WordDelimiterFilterFactory" generateWordParts="0" generateNumberParts="0" catenateWords="1" catenateNumbers="1" catenateAll="0" splitOnCaseChange="0" splitOnNumerics="0"/>
-->
  <filter class="solr.LowerCaseFilterFactory"/>
  <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
 </analyzer>
</fieldType>

Step 3. Save and close the file.

Step 4. (For Solr 4 only) Re-start Tomcat.

Step 5. Re-index Solr from the Search Server page in Enterprise Server.

By default, Solr's N-Gram Tokenizer is enabled and generates n-gram tokens of sizes in the default range of 4 – 15 characters. This is configured in the schema.xml file.

If you wish to adjust the default range or to disable the tokenizer, please make sure that these changes are also reflected in the config_solr.php file by following the steps below.

Step 1. Open the file <Solr installation directory>/schema.xml.

Step 2. Locate any reference to 'solr.NGramFilterFactory':

<filter class="solr.NGramFilterFactory" minGramSize="4" maxGramSize="15"/>

Step 3. To adjust the default range simply change the minGramSize and/or maxGramSize attributes of the filter, for example:

<filter class="solr.NGramFilterFactory" minGramSize="3" maxGramSize="18"/>

Or, to disable the n-gram tokenizer, comment-out the filter option as follows:

<!--
<filter class="solr.NGramFilterFactory" minGramSize="4" maxGramSize="15"/>
-->

Step 4. Save and close the file.

Step 5. Open the config_solr.php file.

Tip: (For Enterprise Server 10.1 or higher only) Easily manage and configure settings of all configuration files by adding them to a single configuration file.

Step 6. Locate the SOLR_NGRAM_SIZE option:

//Defines the range used for NGRAM size
define ('SOLR_NGRAM_SIZE', serialize(array(	
4,	// MinGramSize
15,	// MaxGramSize
)));  

Step 7. To adjust the default range, simply change the values configured for the MinGramSize and/or MaxGramSize options, for example:

 //Defines the range used for NGRAM size
define ('SOLR_NGRAM_SIZE', serialize(array(
   3, // MinGramSize
   18 // MaxGramSize
)));

Or, to disable the n-gram tokenizer, comment-out the option as follows:

// Defines the range used for NGRAM size
//define ('SOLR_NGRAM_SIZE', serialize(array(
//   4, // MinGramSize
//   15 // MaxGramSize
//)));

Step 8. Save and close the file.

Step 9. (For Solr 4 only) Re-start Tomcat.

Step 10. Re-start Solr.

Step 11. Re-index Solr from the Search Server page in Enterprise Server.

Step 1. Open the file <Solr installation directory>/schema.xml.

Step 2. Look up the fieldType block starting with <fieldType name="textNGram".

This block contains 2 definitions for 'solr.WordDelimiterFilterFactory' (in analyzer type="index" and "query").

Step 3. Have the original token indexed without modifications by setting preserveOriginal="1"

<filter class="solr.WordDelimiterFilterFactory" preserveOriginal="1" generateWordParts="0" generateNumberParts="0" catenateWords="1" catenateNumbers="1" catenateAll="0" splitOnCaseChange="0" splitOnNumerics="0"/>

Step 4. Save and close the file.

Step 5. (For Solr 4 only) Restart Tomcat (it might also be needed to restart Apache as well).

The applied schema.xml changes now need to be applied to the database objects.

Step 6. Access the Search Server Maintenance page in Enterprise Server.

Step 7. In the Indexing section, click Clear, followed by Start.