KeywordTokenizerFactory splits the string for the exclamation mark

Hi All

I have a following field settings in solr schema

<field name="<b>Exact_Word" omitPositions="true" termVectors="false" omitTermFreqAndPositions="true" compressed="true" type="string_ci" multiValued="false" indexed="true" stored="true" required="false" omitNorms="true"/>

<field name="Word" compressed="true" type="email_text_ptn" multiValued="false" indexed="true" stored="true" required="false" omitNorms="true"/>

<fieldtype name="string_ci" class="solr.TextField" sortMissingLast="true" omitNorms="true"><analyzer><tokenizer class="solr.KeywordTokenizerFactory"/><filter class="solr.LowerCaseFilterFactory"/></analyzer></fieldtype>

<copyField source="Word" dest="Exact_Word"/>

As you can see Exact_Word has the KeywordTokenizerFactory and that should treat the string as it is.

Following is my responseHeader. As you can see I am searching my string only in the filed Exact_Word and expecting it to return the Word field and the score

"responseHeader":{

    "status":0,

    "QTime":14,

    "params":{

      "explainOther":"",

      "fl":"Word,score",

      "debugQuery":"on",

      "indent":"on",

      "start":"0",

      "q":"d!sdasdsdwasd!asd@dsadsadas.edu",

      "qf":"Exact_Word",

      "wt":"json",

      "fq":"",

      "version":"2.2",

      "rows":"10"}},

But when I enter email with the following string "d!sdasdsdwasdasd@dsadsadas.edu" it splits the string to two. I was under the impression that KeywordTokenizerFactory will treat the string as it is.

Following is the query debug result. There you can see it has split the word

"parsedquery":"+((DisjunctionMaxQuery((Exact_Word:d)) -DisjunctionMaxQuery((Exact_Word:sdasdsdwasdasd@dsadsadas.edu)))~1)",

can someone please tell why it produce the query result as this

If I put a string without the "!" sign as below, the produced query will be as below

"parsedquery":"+DisjunctionMaxQuery((Exact_Word:d_sdasdsdwasd_asd@dsadsadas.edu))",. This is what I expected solr to even with the "!" mark. with "_" mark it wont do a string split and treats the string as it is

I thought if the KeywordTokenizerFactory is applied then it should return the exact string as it is

Please help me to understand what is going wrong here