Solr: QueryElevationComponent requires StrField uniqueKeyField error

Question

I recently installed solr. The example index (found at apache-solr-#.#.#\example\solr) seems to work, and, once copied to my solr home directory, I am able to access it through the admin pages. However when I try to implement a new index by replacing the schema.xml content with (taken from here):

<?xml version="1.0" encoding="UTF-8" ?> 
  <schema name="example" version="1.2">
  <types>
      <fieldType name="string" class="solr.StrField" sortMissingLast="true" omitNorms="true" /> 
      <fieldType name="int" class="solr.TrieIntField" precisionStep="0" omitNorms="true" positionIncrementGap="0" /> 
      <fieldType name="date" class="solr.TrieDateField" omitNorms="true" precisionStep="0" positionIncrementGap="0" /> 
      <fieldType name="text" 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="0" splitOnCaseChange="1" /> 
              <filter class="solr.LowerCaseFilterFactory" /> 
              <filter class="solr.SnowballPorterFilterFactory" language="English" protected="protwords.txt" /> 
          </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" enablePositionIncrements="true" /> 
          <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="1" /> 
          <filter class="solr.LowerCaseFilterFactory" /> 
          <filter class="solr.SnowballPorterFilterFactory" language="English" protected="protwords.txt" /> 
        </analyzer>
      </fieldType>
      </types>
  <fields>
      <field name="fileid" type="int" indexed="true" stored="true" required="true" /> 
      <field name="doctext" type="text" indexed="true" stored="false" required="false" /> 
      <field name="title" type="text" indexed="true" stored="false" required="false" /> 
      <field name="datecreated" type="date" indexed="true" stored="false" /> 
  </fields>
  <uniqueKey>fileid</uniqueKey> 
  <defaultSearchField>doctext</defaultSearchField> 
  <solrQueryParser defaultOperator="OR" /> 
  </schema>

I am receiving a configuration error, which seems to suggest that the uniqueKeyField must be implemented with a StrField type (something I find hard to believe is actually the case?)):

"HTTP Status 500 - Severe errors in solr configuration. ... org.apache.solr.common.SolrException: QueryElevationComponent requires the schema to have a uniqueKeyField implemented using StrField at org.apache.solr.handler.component.QueryElevationComponent.inform(QueryElevationComponent.java:157) at org.apache.solr.core.SolrResourceLoader.inform(SolrResourceLoader.java:508) at..."

My googling has turned up very little to help, so I am hoping there might be someone around here who might have come across this issue and/or have some ideas how to resolve it?

Thanks in advance for any advice, Bea.

Answer 1

Yes, at the moment QueryElevationComponent requires a string unique key. This limitation is documented in the Solr wiki.

Here's the issue in the project JIRA.