SOLR Case Insensitive Search

Question

I've a problem in SOLR Search.
I have a data like this:

I use solr admin to find this data using query like this:

address_s:*Nadi*

and found those data. But when I use this query:

address_s:*nadi*

it doesn't found anything.
I've googling and I found an answer to create a field with the following script:

<fieldType name="c_text" class="solr.TextField">
    <analyzer type="index">
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
    </analyzer>

    <analyzer type="query">
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
    </analyzer>
</fieldType>

I've copy paste those script into schema.xml, but it still doesn't work. What should I do? Can anyone help me?

Answer 1

The address_s field should be defined as -

<field name="address_s" type="c_text" indexed="true" stored="true"/>

If you are using the default schema.xml, this defination should come before -

<dynamicField name="*_s"  type="string"  indexed="true"  stored="true"/>

which defines it as a string field type with no analysis performed.

Wildcard queries does not undergo analysis.
So if you apply lower case filter at index time query address_s:*nadi* would work.
However, query address_s:*Nadi* would not, as Nadi will not match nadi in index and you would need to lower case the queries at client side.

Answer 2

I've used this as field type:

<fieldType name="string" class="solr.TextField">
  <analyzer type="index">
    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
    <filter class="solr.LowerCaseFilterFactory"/>
  </analyzer>
  <analyzer type="query">
    <tokenizer class="solr.WhitespaceTokenizerFactory"/>
    <filter class="solr.LowerCaseFilterFactory"/>
  </analyzer>
</fieldType>

And defined my fields using:

<field name="address" type="string" indexed="true" stored="true"/>

The result: My document returns the fields in the right case (like inserted) and I can search case-insensitive (using both upper- and lowercase letters)...

Version: Solr 3.6

Answer 3

Does your address_s field use this c_text field type in your schema.xml?

If your index has been created with the previous configuration, you need to re-index everything to take the changes into account.

Answer 4

I have used something like this ... In schema.xml i 've put a new fieldType

<fieldType name="newType" class="solr.TextField" positionIncrementGap="100">
      <analyzer type="index">
        <tokenizer class="solr.KeywordTokenizerFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
        <filter class="solr.ReversedWildcardFilterFactory" />
      </analyzer>
      <analyzer type="query">
        <tokenizer class="solr.KeywordTokenizerFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
        <filter class="solr.ReversedWildcardFilterFactory" />
      </analyzer>
 </fieldType>

Assign the new type to the field that you want to make it case & whitespace insensitive Then you have to construct the solr query in the form : fieldName:(*fieldValue\ *)