Solr does not generate highlights when uniqueId field is not defined in the
schema
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Key: SOLR-488
URL: https://issues.apache.org/jira/browse/SOLR-488
Project: Solr
Issue Type: Improvement
Components: highlighter
Affects Versions: 1.2
Environment: Windows Vista Business (x86, x64), latest Ubuntu server,
Apache Tomcat 6.0.14
Reporter: Tomer Gabel
Attachments: linkfield.HighlightingUtils.patch
Solr does not generate highlights when there is no uniqueId field defined in
the schema. I believe the reason for this is that it's very difficult to modify
or extend the XmlWriter behavior, which is why highlights reside in their own
"section" in the response XML and subsequently need to be "linked" to their
respective documents via the uniqueId field.
Our schema does not define a uniqueId for various reasons but we still need
highlights; the solution we came up with was to provide a user-definable "link
field," which is the document field whose value resides in the {{<lst
name="215">}} elements in the generated output. I will presently attach a patch
which adds a "hl.link" query parameter, which takes a field name and uses that
as the "link field." If the parameter is not specified the original behavior is
used, so backwards compatibility is maintained.
As an aside, we've found this technique to be useful because our custom
handlers add a lot of information to each document, and the way the response
writer is implemented makes it nigh impossible to add information to any
specific document within the response. I should probably open an issue which
calls to reimplement this aspect of Solr.
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