Apache Solr Reference Guide Covering Apache Solr 6.0

The Terms Component
The Terms Component provides access to the indexed terms in a field and the number of documents that match
each term. This can be useful for building an auto-suggest feature or any other feature that operates at the term
level instead of the search or document level. Retrieving terms in index order is very fast since the
implementation directly uses Lucene's TermEnum to iterate over the term dictionary.
In a sense, this search component provides fast field-faceting over the whole index, not restricted by the base
query or any filters. The document frequencies returned are the number of documents that match the term,
including any documents that have been marked for deletion but not yet removed from the index.
Configuring the Terms Component
By default, the Terms Component is already configured in solrconfig.xml for each collection.
Defining the Terms Component
Defining the Terms search component is straightforward: simply give it a name and use the class solr.TermsC
omponent.
This makes the component available for use, but by itself will not be useable until included with a request
handler.
Using the Terms Component in a Request Handler
The /terms request handler is also defined in solrConfig.xml by default.
true
false
terms
Note that the defaults for the this request handler set the parameter "terms" to true, which allows terms to be
returned on request. The parameter "distrib" is set to false, which allows this handler to be used only on a single
Solr core. To finish out the configuration, he Terms Component is included as an available component to this
request handler.
You could add this component to another handler if you wanted to, and pass "terms=true" in the HTTP request in
order to get terms back. If it is only defined in a separate handler, you must use that handler when querying in
order to get terms and not regular documents as results.
Terms Component Parameters
Apache Solr Reference Guide 6.0
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