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You can integrate the Apache Unstructured Information Management Architecture (UIMA) with Solr. UIMA lets you define custom pipelines of Analysis Engines that incrementally add metadata to your documents as annotations.

For more information about Solr UIMA integration, see https://wiki.apache.org/solr/SolrUIMA.

Configuring UIMA

The SolrUIMA UpdateRequestProcessor is a custom update request processor that takes documents being indexed, sends them to a UIMA pipeline, and then returns the documents enriched with the specified metadata. To configure UIMA for Solr, follow these steps:

  1. Copy solr-uima-4.x.y.jar (under /solr-4.x.y/dist/) and its libraries (under contrib/uima/lib) to a Solr libraries directory, or set <lib/> tags in solrconfig.xml appropriately to point to those jar files:

    <lib dir="../../contrib/uima/lib" />
    <lib dir="../../dist/" regex="solr-uima-\d.*\.jar" />
  2. Modify schema.xml, adding your desired metadata fields specifying proper values for type, indexed, stored, and multiValued options. For example:

    <field name="language" type="string" indexed="true" stored="true" required="false"/>
    <field name="concept" type="string" indexed="true" stored="true" multiValued="true" required="false"/>
    <field name="sentence" type="text" indexed="true" stored="true" multiValued="true" required="false" />
  3. Add the following snippet to solrconfig.xml:

    <updateRequestProcessorChain name="uima">
      <processor class="org.apache.solr.uima.processor.UIMAUpdateRequestProcessorFactory">
        <lst name="uimaConfig">
          <lst name="runtimeParameters">
            <str name="keyword_apikey">VALID_ALCHEMYAPI_KEY</str>
            <str name="concept_apikey">VALID_ALCHEMYAPI_KEY</str>
            <str name="lang_apikey">VALID_ALCHEMYAPI_KEY</str>
            <str name="cat_apikey">VALID_ALCHEMYAPI_KEY</str>
            <str name="entities_apikey">VALID_ALCHEMYAPI_KEY</str>
            <str name="oc_licenseID">VALID_OPENCALAIS_KEY</str>
          </lst>
          <str name="analysisEngine">/org/apache/uima/desc/OverridingParamsExtServicesAE.xml</str>
          <!-- Set to true if you want to continue indexing even if text processing fails.
               Default is false. That is, Solr throws RuntimeException and
               never indexed documents entirely in your session. -->
          <bool name="ignoreErrors">true</bool>
          <!-- This is optional. It is used for logging when text processing fails.
               If logField is not specified, uniqueKey will be used as logField.
          <str name="logField">id</str>
          -->
          <lst name="analyzeFields">
            <bool name="merge">false</bool>
            <arr name="fields">
              <str>text</str>
            </arr>
          </lst>
          <lst name="fieldMappings">
            <lst name="type">
              <str name="name">org.apache.uima.alchemy.ts.concept.ConceptFS</str>
              <lst name="mapping">
                <str name="feature">text</str>
                <str name="field">concept</str>
              </lst>
            </lst>
            <lst name="type">
              <str name="name">org.apache.uima.alchemy.ts.language.LanguageFS</str>
              <lst name="mapping">
                <str name="feature">language</str>
                <str name="field">language</str>
              </lst>
            </lst>
            <lst name="type">
              <str name="name">org.apache.uima.SentenceAnnotation</str>
              <lst name="mapping">
                <str name="feature">coveredText</str>
                <str name="field">sentence</str>
              </lst>
            </lst>
          </lst>
        </lst>
      </processor>
      <processor class="solr.LogUpdateProcessorFactory" />
      <processor class="solr.RunUpdateProcessorFactory" />
    </updateRequestProcessorChain>

    VALID_ALCHEMYAPI_KEY is your AlchemyAPI Access Key. You need to register an AlchemyAPI Access key to use AlchemyAPI services: http://www.alchemyapi.com/api/register.html

    VALID_OPENCALAIS_KEY is your Calais Service Key. You need to register a Calais Service key to use the Calais services: http://www.opencalais.com/apikey

    analysisEngine must contain an AE descriptor inside the specified path in the classpath. 

    analyzeFields must contain the input fields that need to be analyzed by UIMA. If merge=true then their content will be merged and analyzed only once. 

    Field mapping describes which features of which types should go in a field.

  4. In your solrconfig.xml replace the existing default UpdateRequestHandler or create a new UpdateRequestHandler:

    <requestHandler name="/update" class="solr.XmlUpdateRequestHandler">
      <lst name="defaults">
        <str name="update.processor">uima</str>
      </lst>
    </requestHandler>

Once you are done with the configuration your documents will be automatically enriched with the specified fields when you index them.

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