Hi Jo
From the UI, it's used the search field *any *, that is mapped to a Lucene
field call *any* also, that for each metadata contains all the text content
of the metadata. It doesn't matter what you write in the UI search field it
produces a query with an AND of all terms, so if you search for sample
downloadin the UI or in the q service:
http://localhost:8080/geonetwork/srv/eng/q?_content_type=json&
*any=sample%20download*
that produces this Lucene query: *+(+any:sample +any:download)* that is and
AND for both terms.
Even if you write sample or download, the or term is currently removed as
the any field is setup as Lucene analysed field and it's processed to
tokenize the search values and remove stopword (useless search items like:
the, or, etc.)
There's another search field call *or* that is mapped to the same Lucene
field *any, *but if you use it (it requires to update the UI field or use
the q service:
http://localhost:8080/geonetwork/srv/eng/q?_content_type=json&
*or=sample%20download*
that produces this Lucene query: *+(any:sample any:download)* that is and
AND for both terms.
So currently in the search field that is used in the UI, sending the values
separated with or it doesn't affect, it depends on the search field
configured (*any* / *or*), by default is used *any*. This probably requires
some review to improve the way that works.
Other Lucene fields that are not configured to be analysed (not configured
here:
https://github.com/geonetwork/core-geonetwork/blob/3.4.x/web/src/main/webapp/WEB-INF/config-lucene.xml#L330-L341),
for example *topicCat*, you can send the field with the values separated by
the word *or* at least from the q service, from the UI it's not available,
but could be added:
http://localhost:8080/geonetwork/srv/eng/q?topicCat =farming+or+biota
that produces this Lucene query: *+(topicCat:farming **topicCat:biota**) *with
an OR of the values
Another option is to use an or for a value between different fields, so for
example if the current search field instead of using *any* field, would use
*title_OR_abstract_OR_any* field name, the search would be done in the 3
fields, the good point about this is that can be configured the boost for
the fields to promote in the sort by relevance to give higher relevance to
metadata containing the search items in the title or abstract (A change
related to this will be committed soon to improve the search results).
Regards,
Jose García
On Fri, May 18, 2018 at 11:43 AM, Jo Cook <jocook@anonymised.com>
wrote:
Hi List,
I'm trying to understand how to create multi-term search queries in the
geonetwork search box in 3.4, for example term1 OR term2.
I've read up on the lucene query syntax but whatever I try produces 0
results.
Could someone give me an example of how to correctly use an OR query
please? I'd be happy to contribute to the user documentation with some
examples.
Thanks
Jo
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