Details
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Type:
Improvement
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Status: Closed
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Priority:
High
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: Customer request
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Component/s: Documentation
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Labels:
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Environment:
eZ Find
Description
the current "relevancy" sorting in solr does not take into account the date of the documents.
The desired solution is to have a proper age-based boost factor to tune the relevancy score of matched documents.
an introduction to the problem can be found here:
http://wiki.apache.org/solr/SolrRelevancyFAQ#How_can_I_boost_the_score_of_newer_documents
Activity
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Minimal doc:
Since eZ Publish 5, the boost_functions parameter is extended and now properly
supports all boosting capabilities of Solr in order to fine-tune the search result
relevancy scores.
A) Fetch function parameters
Most boost features are exposed via ezfind's native search fetch function parameters.
The existing boost_function now has 4 distinct subparameters, each of them accepting an array of
expressions corresponding to the Solr edismax boost parameters.
1) 'fields'
-----------
Fields can be specified either in the form <class_identifier>/<attribute identifier>
or as a their raw field identifier in the Solr index (typically for custom fields)
Example:
... 'boost_functions', hash('fields',array('article/tags:3')) ....
or with a raw Solr field identifier
... 'boost_functions', hash('fields',array('attr_tags_lk:3')) ....
which will apply a boost factor of 3
for the tags attribute at query time if matches are found there
2) 'mfunctions' (since eZ Find 2.8 / eZ Publish 5)
--------------------------------------------------
These correspond to the Solr edismax 'boost' parameter and multiply the score
with the function value. This is usually what you should use (and not the additive 'functions')
Example for age based boosting:
... 'boost_functions', hash('mfunctions', array('recip(ms(NOW/DAY,meta_published_dt),3.16e-11,0.5,0.5)' )) ....
3) 'functions':
----------------
These are like mfunctions, but add their value to teh relevancy score
Example:
.... 'boost_functions', hash('functions', array('sum(product(attr_importance_si,0.1),1)')) ...
4) 'queries'
------------
These are added to the main query and need to follow the Solr/Lucene query format ans specify the boost factor explicitely for it
Example:
'boost_functions', hash('queries', array('meta_class_identifier_ms:article^10')),
B) Through ini settings
There is also a possibility to define site-wide raw boost queries in ezfind.ini, for example
[QueryBoost]
#RawBoostQueries[]
RawBoostQueries[]=meta_class_identifier_ms:summary^4
See pull request https://github.com/ezsystems/ezfind/pull/70
The following documents have been updated:
http://doc.ez.no/Extensions/eZ-Publish-extensions/eZ-Find/eZ-Find-LS-5.0.0/Basic-Configuration/Configuration-settings-eZ-Find#queryboost
http://doc.ez.no/Extensions/eZ-Publish-extensions/eZ-Find/eZ-Find-LS-5.0.0/Advanced-Configuration/Boosting-Dedicated-Functions