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There are currently several "default" SearchComponents which now comprise the default SearchHandler. They are:
- query - QueryComponent
- facet - FacetComponent
- mlt - MoreLikeThis
- highlight - Highlighting
- stats - Statistics Solr1.4
- debug - Debug
These examples are enabled by default, but can be overridden by writing your own class that extends SearchComponent and then declare it in the solrconfig.xml with the appropriate name. For instance, to override the "query" component, one would declare:
Other useful components are:
- SpellCheckComponent – Exposes advanced support for spell checking such as multiple (per-field) dictionaries, loading dictionaries from files, lucene indices and Solr fields, support for analyzers, collation, query parsing and pluggable spell checker implementations. The default implementation provided with Solr uses the Lucene contrib SpellChecker. This component can also provide an autocomplete functionality when used in combination with a Suggester instead of SpellChecker.
- QueryElevationComponent – Used to "elevate" results based on editorial decisions, not relevance.
- TermVectorComponent – Retrieve Term Vector information. See https://issues.apache.org/jira/browse/SOLR-651 Solr1.4
- StatsComponent – Get Numeric field statistics. See https://issues.apache.org/jira/browse/SOLR-680 Solr1.4
- ClusteringComponent – Cluster results and documents. See https://issues.apache.org/jira/browse/SOLR-769 Solr1.4
- TermsComponent – Get access to Lucene's TermEnum capability, providing access to the Term dictionary. See https://issues.apache.org/jira/browse/SOLR-877 Solr1.4
- BloomIndexComponent – Quickly check for the existence of a term using a Bloom Filter. See https://issues.apache.org/jira/browse/SOLR-1375 Solr4.0
Components can also be initialized with NamedList params. For example, the Query Elevator (editorial boosting) can be declared with:
Components can be reused by multiple instances of SearchHandler – either by prepending (first-components), appending (last-components), or replacing (components) the default list...
It was first introduce as part of SOLR-281