Elastic Search filtering with the snowball Analyzer

snowball_analyzer_filtering

1. Configure and create index. The index is created with a snowball analyzer
curl -XPUT http://localhost:9200/page_index/ -d "
index:
  analysis: 
    analyzer:
      default:
        tokenizer: uax_url_email
        type: snowball"

2) The mapping for the page_index is 
Mapping
{
  "page_index" : {
    "pages" : {
      "properties" : {
        "name" : {
          "type" : "string"
        },
        "number" : {
          "type" : "long"
        }
      }
    }
  }
}

3) A search query for the word "test" and applying a filter on a long field yields the expected search results. 

curl -XGET "http://localhost:9200/page_index/_search?pretty=true" -d '{"query": {"queryString": {"default_operator":"AND","query":"test"}}, "filter" : {"term" : {number": 2 }}}'

4) A similar search query for the word "test" but applying a filter on a string field returns no results.
curl -XGET "http://localhost:9200/page_index/_search?pretty=true" -d '{"query": {"queryString": {"default_operator":"AND","query":"test"}}, "filter" : {"term" : {"name": "blah" }}}'

5) If the Analyzer type is changed from "snowball" to standard, both the above search queries return the expected results. Any ideas?