Solr More Like This (MLT) not returning results

Question

I'm currently looking to implement more like this functionality based on a on a number of fields in my index.

My current configuration is as follows: Haystack | PySolr | Solr

For this piece I'm using PySolr and passing the parameters to the more_like_this function. The response finds the document but not any related results. Why is that?

Here is the URL I hit:

http://localhost:8080/solr/mlt?q=django_id:12123412&mlt.fl=industry_ids,loc_state,amount,sector_id&mlt.interestingTerms=details

Here is my response from Solr:

<response>
<object type="{XXXXXX-0F1D-4F28-AAA2-XXXXXXXXXXX}" cotype="cs" id="cosymantecbfw" style="width: 0px; height: 0px; display: block;"/>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">24</int>
</lst>
<result name="match" numFound="1" start="0">
    <doc>...</doc>
</result>
<result name="response" numFound="0" start="0"/>
<lst name="interestingTerms"/>
</response>

solrconfig.xml

<!-- More Like This -->
<requestHandler name="/mlt" class="solr.MoreLikeThisHandler">
</requestHandler>

schema.xml

<field name="award_amount" type="sfloat" indexed="true" stored="true" multiValued="false" termVectors="true" />
<field name="estatus" type="slong" indexed="true" stored="true" multiValued="false" termVectors="true"/>
<field name="loc_state" type="string" indexed="true" stored="true" multiValued="false" termVectors="true"/>
<field name="orgtype_id" type="string" indexed="true" stored="true" multiValued="false" termVectors="true" />
<field name="sector_id" type="string" indexed="true" stored="true" multiValued="false" termVectors="true"/>
<field name="industry_ids" type="string" indexed="true" stored="true" multiValued="true" termVectors="true" />
<field name="award_amount_exact" type="sfloat" indexed="true" stored="true" multiValued="false" termVectors="true" />
<field name="sector_id_exact" type="string" indexed="true" stored="true" multiValued="false" termVectors="true"/>
<field name="amount_exact" type="sfloat" indexed="true" stored="true" multiValued="false" termVectors="true"/>

Any help would be appreciated!

Answer 1

Your text fields must have type text, which processes them to make them searchable. The string fields are stored and queried as they are, so they are not searchable, making them useless for MLT.

Refer copy fields if you ever want to store the same data as both text and string (for example, faceting).

---

I see you also intend to find numbers closest to our query. MLT is not right for that. You want to compose a function query for that. SolR : More Like This on number fields