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Apache lucene indexing3/26/2023 ![]() The above diagram is a high level representation of the query execution mechanism of Apache Oak.įirst, the query is parsed into an Abstract Syntax Tree. Oak then chooses the indexer with the lowest estimated cost. If multiple indexers are available for a query, each available indexer estimates the cost of executing the query. This means that the content is not indexed and content nodes are traversed to find matches to the query. The Traversal Index is used if no other indexer is available. Implementations for Apache Lucene and Solr are also available by default, which both support fulltext indexing. One indexer is the Property Index, for which the index definition is stored in the repository itself. The Apache Oak based backend allows different indexers to be plugged into the repository. The Oak query engine supports the following languages: ) consider creating an index or changing the query If Oak encounters a query without an index, a WARN level log message is printed: *WARN* Traversed 1000 nodes with filter Filter(query=select. The query may still work but probably be very slow. If there is no index for a specific query, possibly many nodes will be traversed. Custom indexes need to be created when necessary, much like with traditional relational databases. Unlike Jackrabbit 2, Oak does not index content by default. For best practices on optimizing query and indexing performance, see Best Practices for Queries and Indexing. This article is about configuring indexes in AEM 6.
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