error fixing & add fields to ScoredDocument for SearchResponse

[rchardzhu]

1. fix error: not enough arguments in call to searcher.IndexDocument
2. add fields to ScoredDocument for SearchResponse usage: i := 0 for _, hit := range result.Docs { log.Println("id, score: ", hit.DocId, hit.Scores) var article Article json.Unmarshal(hit.Fields.([]byte), &article) log.Println("fileds: ", article) i++ }