I am trying to boost relevancy based on a date field with dismax, and
I've included the requestHandler config below. The post_date field in
my database is simple UNIX time, seconds since epoch. It's in a MySQL
bigint field, so I've stored it as a tlong in Solr. This filed is
required by our application in integer format.
You can see a boost function commented out below that I tried to use,
which should multiply the post_date by 1000 to match the Solr way of
milliseconds since epoch, then use a reciprocal example similar to one I
found on the Solr Wiki. When I uncomment it, I get an error message:
Problem accessing /solr/ncmain/select. Reason:
undefined field product(post_date
Lance Norskog mentioned that boost functions are slow, and suggested
that I use something like the following query, which I am willing to
try, but I first have to get my "seconds since epoch" into a format that
Solr can use. So, I need two things that I cannot figure out how to
do. One is schema.xml (or DIH, maybe?) config to convert the date
format into an additional field, the other is exactly what to put in the
dismax requestHandler to automatically include the boost.
[NOW-6MONTHS TO NOW]^5.0 ,
[NOW-1YEARS TO NOW-6MONTHS]^3.0
[NOW-2YEARS TO NOW-1YEARS]^2.0
[* TO NOW-2YEARS]^1.0
My current dismax requestHandler, some of which is still a work in progress:
<requestHandler name="dismax" class="solr.SearchHandler">
<lst name="defaults">
<str name="defType">dismax</str>
<bool name="partialResults">true</bool>
<int name="timeAllowed">6000</int>
<str name="echoParams">explicit</str>
<int name="rows">50</int>
<str
name="shards">idxinc:8983/solr/live,idxst0-b:8983/solr/live,idxst1-b:8983/solr/live,idxst2-b:8983/solr/live,idxst3-b:8983/solr/live,idxst4-b:8983/solr/live,idxst5-b:8983/solr/live</str>
<float name="tie">0.1</float>
<str name="qf">doc_id^5 text_preview^1.25 ft_text keywords^0.75
ft_dname^1.25</str>
<str name="pf">doc_id^5 text_preview^1.25 ft_text keywords^0.75
ft_dname^1.25</str>
<!--
<str name="bf">recip(ms(NOW,product(post_date,1000)),3.17e-11,1,1)</str>
-->
<str name="fl">score,*</str>
<str name="mm">0<-1 4<-50%</str>
<str name="q.alt">*:*</str>
</lst>
</requestHandler>
