Weird behavior of Elasticsearch 1.0.1

gistfile1.sh

# Delete the index if exists
$ curl -XDELETE "http://localhost:9200/sample"
{"acknowledged":true}

# Create "sample" index, with standard analyzer using comma character for tokenizing
$ curl -XPUT "http://localhost:9200/sample" -d '
{
    "settings" : {
        "index" : {
            "analysis" : {
                "analyzer" : {
                    "standard" : {
                        "filter" : [ "lowercase" ],
                        "tokenizer" : "comma"
                    },
                    "default_index" : {
                        "filter" : [ "lowercase" ],
                        "tokenizer" : "comma"
                    }
                },
                "tokenizer" : {
                    "comma" : {
                        "pattern" : ",",
                        "type" : "pattern"
                    }
                }
            }
        }
    }
}
'
{"acknowledged":true}

# Add a record
$ curl -XPOST "http://localhost:9200/sample/users/1" -d'
{
    "random_string" : "ABC,XYZ",
    "random_number" : "123456,7890123",
    "random_email"  : "abc@foobar.com,abc@foobar.net"
}'

{"_index":"sample","_type":"users","_id":"1","_version":1,"created":true}

# Refresh index
$ curl -XPOST "http://localhost:9200/sample/_refresh"
{"_shards":{"total":10,"successful":10,"failed":0}}

# Try to search for 123456
$ curl -XGET "http://localhost:9200/sample/_search?q=123456"
{"took":4,"timed_out":false,"_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":0,"max_score":null,"hits":[]}}


# Now try to delete the record then add another one, same content but with one field removed:

$ curl -XDELETE "http://localhost:9200/sample/users/1"
{"found":true,"_index":"sample","_type":"users","_id":"1","_version":2}


$ curl -XPOST "http://localhost:9200/sample/users/1" -d'
{
    "random_number" : "123456,7890123",
    "random_email"  : "abc@foobar.com,abc@foobar.net"
}'

{"_index":"sample","_type":"users","_id":"1","_version":3,"created":true}

# Refresh the index
$ curl -XPOST "http://localhost:9200/sample/_refresh"
{"_shards":{"total":10,"successful":10,"failed":0}}

# Search again with the same query
$ curl -XGET "http://localhost:9200/sample/_search?q=123456"
{"took":2,"timed_out":false,"_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":1,"max_score":0.15342641,"hits":[{"_index":"sample","_type":"users","_id":"1","_score":0.15342641, "_source" : 
{
    "random_number" : "123456,7890123",
    "random_email"  : "abc@foobar.com,abc@foobar.net"
}}]}}