Proximity and phrase search highlighting using fast-vector-highlighter vs. highlighter

gistfile1.txt

1) Indexing with default settings (automatic index creating and type mapping definition -> default/plain highlighter)

curl -XPUT 'http://localhost:9200/twitter/tweet/1' -d '{
    "user" : "kimchy",
    "post_date" : "2009-11-15T14:12:12",
    "message" : "trying out Elastic and Search"
}'

curl -XPUT 'http://localhost:9200/twitter/tweet/2' -d '{
    "user" : "kimchy",
    "post_date" : "2009-11-15T14:12:12",
    "message" : "trying out Search and Elastic"
}'


Proximity search:
curl -XGET 'http://localhost:9200/twitter/tweet/_search' -d '{
    "query" : {
        
    "query_string" : {
        "default_field" : "message",
        "query" : "\"Elastic Search\"~4"
    }

    },
    "highlight" : {
        "fields" : {
            "message" : {}
        }
    }
}
'

Result(both matches' highlighting snippets present):
{
    "took": 320,
    "timed_out": false,
    "_shards": {
        "total": 5,
        "successful": 5,
        "failed": 0
    },
    "hits": {
        "total": 2,
        "max_score": 0.18985549,
        "hits": [
            {
                "_index": "twitter",
                "_type": "tweet",
                "_id": "1",
                "_score": 0.18985549,
                "_source": {
                    "user": "kimchy",
                    "post_date": "2009-11-15T14:12:12",
                    "message": "trying out Elastic and Search"
                },
                "highlight": {
                    "message": [
                        "trying out <em>Elastic</em> and <em>Search</em>"
                    ]
                }
            },
            {
                "_index": "twitter",
                "_type": "tweet",
                "_id": "2",
                "_score": 0.13424811,
                "_source": {
                    "user": "kimchy",
                    "post_date": "2009-11-15T14:12:12",
                    "message": "trying out Search and Elastic"
                },
                "highlight": {
                    "message": [
                        "trying out <em>Search</em> and <em>Elastic</em>"
                    ]
                }
            }
        ]
    }
}

Exact phrase search:
curl -XGET 'http://localhost:9200/twitter/tweet/_search' -d '{
    "query" : {
        
    "query_string" : {
        "default_field" : "message",
        "query" : "\"Elastic and Search\""
    }

    },
    "highlight" : {
        "fields" : {
            "message" : {}
        }
    }
}
'

Result (highlighting returned, present on non-stop words):
{
    "took": 250,
    "timed_out": false,
    "_shards": {
        "total": 5,
        "successful": 5,
        "failed": 0
    },
    "hits": {
        "total": 1,
        "max_score": 0.30685282,
        "hits": [
            {
                "_index": "twitter",
                "_type": "tweet",
                "_id": "1",
                "_score": 0.30685282,
                "_source": {
                    "user": "kimchy",
                    "post_date": "2009-11-15T14:12:12",
                    "message": "trying out Elastic and Search"
                },
                "highlight": {
                    "message": [
                        "trying out <em>Elastic</em> and <em>Search</em>"
                    ]
                }
            }
        ]
    }
}




2) Indexing with "term_vector" ("term_vector" : "with_positions_offsets" -> fast-vector-highlighter)

curl -XPUT 'http://localhost:9200/twitter/'

curl -XPUT 'http://localhost:9200/twitter/tweet/_mapping' -d '{
      "text": {
          "properties": {
              "message": {
                  "type": "string",
                  "store": "yes",
                  "term_vector": "with_positions_offsets"
              }
          }
      }
  }'

curl -XPUT 'http://localhost:9200/twitter/tweet/1' -d '{
    "user" : "kimchy",
    "post_date" : "2009-11-15T14:12:12",
    "message" : "trying out Elastic and Search"
}'

curl -XPUT 'http://localhost:9200/twitter/tweet/2' -d '{
    "user" : "kimchy",
    "post_date" : "2009-11-15T14:12:12",
    "message" : "trying out Search and Elastic"
}'

Proximity search:
curl -XGET 'http://localhost:9200/twitter/tweet/_search' -d '{
    "query" : {
        
    "query_string" : {
        "default_field" : "message",
        "query" : "\"Elastic Search\"~4"
    }

    },
    "highlight" : {
        "fields" : {
            "message" : {}
        }
    }
}
'

Result (only one 'right ordered' match has highlighting snippet):
{
    "took": 273,
    "timed_out": false,
    "_shards": {
        "total": 5,
        "successful": 5,
        "failed": 0
    },
    "hits": {
        "total": 2,
        "max_score": 0.2169777,
        "hits": [
            {
                "_index": "twitter",
                "_type": "tweet",
                "_id": "1",
                "_score": 0.2169777,
                "_source": {
                    "user": "kimchy",
                    "post_date": "2009-11-15T14:12:12",
                    "message": "trying out Elastic and Search"
                },
                "highlight": {
                    "message": [
                        "g out <em>Elastic</em> and <em>Search</em> "
                    ]
                }
            },
            {
                "_index": "twitter",
                "_type": "tweet",
                "_id": "2",
                "_score": 0.15342641,
                "_source": {
                    "user": "kimchy",
                    "post_date": "2009-11-15T14:12:12",
                    "message": "trying out Search and Elastic"
                }
            }
        ]
    }
}

Exact phrase search:
curl -XGET 'http://localhost:9200/twitter/tweet/_search' -d '{
    "query" : {
        
    "query_string" : {
        "default_field" : "message",
        "query" : "\"Elastic and Search\""
    }

    },
    "highlight" : {
        "fields" : {
            "message" : {}
        }
    }
}
'

Result (highlighting not even present):
{
    "took": 11,
    "timed_out": false,
    "_shards": {
        "total": 5,
        "successful": 5,
        "failed": 0
    },
    "hits": {
        "total": 1,
        "max_score": 0.30685282,
        "hits": [
            {
                "_index": "twitter",
                "_type": "tweet",
                "_id": "1",
                "_score": 0.30685282,
                "_source": {
                    "user": "kimchy",
                    "post_date": "2009-11-15T14:12:12",
                    "message": "trying out Elastic and Search"
                }
            }
        ]
    }
}