Solr nGram Filter minGramSize - token for word with only 2 characters - solr

Question

I am working with Solr and would like to understand how EdgeNGramFilterFactory works.
For example, I am searching for a term "1 tb". Pls note that I have few products with attributes for the fields I'm search on.
Here is the filter applied on Index time for this fieldtype.
<filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="10" />
Now, when I search for the term "1 tb", I do not get desired results.
I have few products with term "5 MegaPixels" and when I search for "5 meg" it gives me result. Later I found it does not work for "5 me". And does not give results.
If I remove nGram filter, it works fine. Moreover, if we set minGramSize ="1", then query "1 tb" works fine.
I was assuming that for term tb, the token tb should be valid. But it seems that it is not created when I apply minGramSize of 2!
Can someone explain why?
Here is the field defined in schema.
<fieldType name="AttributesField" class="solr.TextField" positionIncrementGap="100">
<analyzer type="index">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-ISOLatin1Accent.txt"/>
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" />
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.EdgeNGramFilterFactory" minGramSize="1" maxGramSize="10" />
<filter class="solr.PorterStemFilterFactory"/>
</analyzer>
<analyzer type="query">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-ISOLatin1Accent.txt"/>
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" />
<filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="true"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.PorterStemFilterFactory"/>
</analyzer>
</fieldType>

Answer 1

Can you try with the below fieldType
<fieldType name="AttributesField" class="solr.TextField" positionIncrementGap="100">
<analyzer type="index">
<tokenizer class="solr.KeywordTokenizerFactory"/>
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" />
<filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="10" />
<filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
<analyzer type="query">
<tokenizer class="solr.KeywordTokenizerFactory"/>
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" />
<filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
</fieldType>
PorterStemFilterFactory : it does normalization process that removes common endings from words.
Example: "riding", "rides", "horses" ==> "ride", "ride", "hors".
<filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="15" side="front"/>
With the configuration below the string value Nigerian gets broken down to the following terms
Nigerian => "ni", "nig", "nige", "niger", "nigeri", "nigeria", "nigeria", "nigerian"