The Simple search implementation are the materials from the 2017 Summit lab AEM Search Demystified. This page contains the materials from this lab. For a guided tour of the lab, please view the Lab workbook in the Presentation section of this page.

Presentation materials

Bookmarks

Chapters

The Chapter links below assume the Initial Packages are installed on AEM Author at http://localhost:4502


Packages

Referenced materials

Corrections and Follow-up

Corrections and clarifications from the lab discussions and answers to follow-up questions from attendees.

  1. How to stop re-indexing?

    Re-indexing can be stopped via the IndexStats MBean available via AEM Web Console > JMX

  2. How can oak indexes support multiple tenants?

    Oak supports placing indexes through-out the content tree, and these indexes will only index within that sub-tree. For example /content/site-a/oak:index/cqPageLucene could be create to index content only under /content/site-a

    An equivalent approach is to use the includePaths and queryPaths properties on an index under /oak:index. For example:

    • /oak:index/siteAcqPageLucene@includePaths=/content/site-a
    • /oak:index/siteAcqPageLucene@queryPaths=/content/site-a

    The considerations with this approach are:

    • Queries MUST specify a path restriction that is equal to the index's query path scope, or be a descendant there of.
    • Broader scoped indexes (for example /oak:index/cqPageLucene) will ALSO index the data, resulting in duplicative-ingestion and disk use cost.
    • May require duplicative configuration managment (ex. adding the same indexRules across multiple tenant indexes if they must satisfy the same query sets)
    • This approach is best served on the AEM Publish tier for custom site search, as on AEM Author, it is common for queries to be executed at high up the content tree for different tenants (for example, via Omnisearch) - different index definitions can result in different behavior based only on the path restriction.
  3. Where is a list of all available Analyzers?

    Oak exposes a set of lucene-provides analyzer configuration elements for use in AEM. 
     
  4. How to search for Pages and Assets in the same query?

    New in AEM 6.3 is the ability to query for mutiple node-types in the same provided query. The following QueryBuilder query. Note that each "sub-query" can resolve to its own index, so in this example, the cq:Page sub-query resolves to /oak:index/cqPageLucene and the dam:Asset sub-query resolves to /oak:index/damAssetLucene.

    group.p.or=true
    group.1_group.type=cq:Page
    # add all page restrictions to this group
    group.2_group.type=dam:Asset
    # add all asset restrictions to this group
    
    

    results in the following query and query plan

    QUERY:(//element(*, cq:Page) | //element(*, dam:Asset))
    
    PLAN: [cq:Page] as [a] /* lucene:cqPageLucene(/oak:index/cqPageLucene) *:* */ union [dam:Asset] as [a] /* lucene:damAssetLucene(/oak:index/damAssetLucene) *:* */

    Explore the query and results via QueryBuilder Debugger and AEM Chrome Plug-in.

  5. How to search over multiple paths in the same query?

    New in AEM 6.3 is the ability to query across mutiple paths in the same provided query. The following QueryBuilder query. Note that each "sub-query" may resolve to its own index. 

    This can be problematic in certain situations such as ranked results, since AEM is not able to sort ACROSS unions. Each UNION'd statement is sorted independently and then the results are concatonated together.

    group.p.or=true
    group.1_group.type=cq:Page
    group.1_group.path=/content/docs/en/6-2
    # add all page restrictions to this group
    group.2_group.type=cq:Page
    group.2_group.path=/content/docs/en/6-3
    # add all asset restrictions to this group
    
    

    results in the following query and query plan

    QUERY: (/jcr:root/content/docs/en/_x0036_-2//element(*, cq:Page) | /jcr:root/content/docs/en/_x0036_-3//element(*, cq:Page))
    
    PLAN: [cq:Page] as [a] /* traverse "/content/docs/en/6-2//*" where isdescendantnode([a], [/content/docs/en/6-2]) */ union [cq:Page] as [a] /* traverse "/content/docs/en/6-3//*" where isdescendantnode([a], [/content/docs/en/6-3]) */

    Explore the query and results via QueryBuilder Debugger and AEM Chrome Plug-in.

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