Filter factory to reduce word from plural forms to singular forms correctly?

[Derek Poh]

Hi

I am using EnglishMinimalStemFilterFactory to reducewords in plural 
forms to singular forms.
The filter factory is not reducingthe plural formof 'es' to the singular 
form correctly. It is reducing correctly for plural form of 's'.
"boxes" is reduced to "boxe" instead of "box"
"glasses" to "glasse" instead of "glass" etc.
I tried with PorterStemFilterFactory, itis able to reduce the plural 
'es' formto singular form correctly. However itreduced "iphones" to 
"iphon" instead.

Is there other filter factory that can reduce pluralto singular correctly?

The field type definition of the field.
    <fieldType class="solr.TextField" name="gs_keyword_exact" 
positionIncrementGap="100">
        <analyzer type="index">
            <tokenizer class="solr.KeywordTokenizerFactory" />
            <filter class="solr.LowerCaseFilterFactory" />
            <filter class="solr.EnglishMinimalStemFilterFactory" />
        </analyzer>
        <analyzer type="query">
            <tokenizer class="solr.KeywordTokenizerFactory" />
            <filter class="solr.LowerCaseFilterFactory" />
            <filter class="solr.EnglishMinimalStemFilterFactory" />
        </analyzer>
    </fieldType>

----------------------
CONFIDENTIALITY NOTICE 

This e-mail (including any attachments) may contain confidential and/or privileged information. If you are not the intended recipient or have received this e-mail in error, please inform the sender immediately and delete this e-mail (including any attachments) from your computer, and you must not use, disclose to anyone else or copy this e-mail (including any attachments), whether in whole or in part. 

This e-mail and any reply to it may be monitored for security, legal, 
regulatory compliance and/or other appropriate reasons.