Stemmer is not working

I created an index for an attachment using elasticsearch2.3.3 and Nest 2.3.2.My indexing is given below. I am searching for singular words with plurals in the document.Read that snowball stemmer will do this type of conversion. But no records were returned on search.Is there any extra plugin/words collection need to be added to the application to make it work. Can anyone help.

 {  
"mydocs":{  
"aliases":{  

},
"mappings":{  
 "indexdocument":{  
    "properties":{  
       "docLocation":{  
          "type":"string",
          "index":"not_analyzed",
          "store":true
       },
       "documentType":{  
          "type":"string",
          "store":true
       },
       "file":{  
          "type":"attachment",
          "fields":{  
             "content":{  
                "type":"string"
             },
             "author":{  
                "type":"string"
             },
             "title":{  
                "type":"string",
                "term_vector":"with_positions_offsets",
                "analyzer":"full"
             },
             "name":{  
                "type":"string"
             },
             "date":{  
                "type":"date",
                "format":"strict_date_optional_time||epoch_millis"
             },
             "keywords":{  
                "type":"string"
             },
             "content_type":{  
                "type":"string"
             },
             "content_length":{  
                "type":"integer"
             },
             "language":{  
                "type":"string"
             }
          }
       },
       "id":{  
          "type":"double",
          "store":true
       },
       "lastModifiedDate":{  
          "type":"date",
          "store":true,
          "format":"strict_date_optional_time||epoch_millis"
       },
       "title":{  
          "type":"string",
          "store":true,
          "term_vector":"with_positions_offsets"
       }
        }
        }
    },
 "settings":{  
 "index":{  
    "creation_date":"1466180794989",
    "analysis":{  
       "filter":{  
          "nGram":{  
             "min_gram":"2",
             "side":"front",
             "type":"edge_ngram",
             "max_gram":"20"
          }
       },
       "analyzer":{  
          "partial":{  
             "filter":[  
                "standard",
                "asciifolding",
                "lowercase",
                "snowball"
             ],
             "type":"custom",
             "tokenizer":"nGram"
          },
          "full":{  
             "filter":[  
                "standard",
                "asciifolding",
                "lowercase",
                "snowball",
                "nGram"
             ],
             "type":"custom",
             "tokenizer":"standard"
          }
       }
    },
    "number_of_shards":"5",
    "number_of_replicas":"1",
    "uuid":"tc-yTpbIQGeGDMOOMspf_g",
    "version":{  
       "created":"2030399"
    }
 }
 },
 "warmers":{  

  }
}
}

I tried stemmer_override also. But no luck. Am I doing anything incorrrect

Solved my issue, refer