Repro for https://github.com/elasticsearch/elasticsearch/issues/3309

script_sort.sh

curl -XDELETE localhost:9200/test-idx
curl -XPUT localhost:9200/test-idx -d '{
    "settings": {
        "index": {
            "number_of_replicas": 0,
            "number_of_shards": 1
        }
    },
    "mappings": {
        "doc": {
            "properties": {
                "filename": {
                    "type": "string", 
                    "index": "not_analyzed"
                }
            }
        }
    }
}'
# Generate random data
for i in {1..100}; do r=$(( RANDOM %= 200 )); n=`printf "%03d" $r`; curl -XPUT localhost:9200/test-idx/doc/$i -d "{\"filename\":\"file$n.abc\"}"; done
curl -XPOST localhost:9200/test-idx/_refresh
echo
echo "=========================="
# Sort using not_analyzed field
curl -s "localhost:9200/test-idx/_search?pretty=true" -d '{
    "from": 0,
    "size": 10,
    "query": {
        "match_all": {}
    },
    "fields": ["filename"],
    "sort": [{
        "_script": {
            "script": "doc[\"filename\"].value",
            "type": "string"
        }
    }]
}' | grep \"sort\"
echo
curl -s "localhost:9200/test-idx/_search?pretty=true" -d '{
    "from": 0,
    "size": 100,
    "query": {
        "match_all": {}
    },
    "fields": ["filename"],
    "sort": [{
        "_script": {
            "script": "doc[\"filename\"].value",
            "type": "string"
        }
    }]
}' | grep \"sort\"