我正在尝试创建具有权重的文本索引，但我无法通过阅读 API 文档弄清楚如何做。

如何在 mgo 中建立如下索引。

db.products.createIndex({ 
  "primaryCategoryIndexes": "text", 
  "secondaryCategoryIndexes": "text", 
  "brandIndex": "text", 
  "primaryTitleIndexes": "text", 
  "secondaryTitleIndexes": "text", 
  "indexCycleId": "text" 
  }, { 
    "weights": { 
      "primaryCategoryIndexes":10, 
      "secondaryCategoryIndexes": 5, 
      "brandIndex": 5, 
      "primaryTitleIndexes": 5, 
      "secondaryTitleIndexes": 5,  
      "indexCycleId": 5 
  }) 

请您参考如下方法:

由于某些奇怪的原因，删除了评论中对此问题的直接回答。我尽量不继续，但我认为最好将答案发回。

可以使用 mgo.Index 中的字段来完成工作。但是我的某些版本不支持它。

请阅读手册: https://godoc.org/gopkg.in/mgo.v2#Index

type Index struct { 
    Key        []string // Index key fields; prefix name with dash (-) for descending order 
    Unique     bool     // Prevent two documents from having the same index key 
    DropDups   bool     // Drop documents with the same index key as a previously indexed one 
    Background bool     // Build index in background and return immediately 
    Sparse     bool     // Only index documents containing the Key fields 
 
    // If ExpireAfter is defined the server will periodically delete 
    // documents with indexed time.Time older than the provided delta. 
    ExpireAfter time.Duration 
 
    // Name holds the stored index name. On creation if this field is unset it is 
    // computed by EnsureIndex based on the index key. 
    Name string 
 
    // Properties for spatial indexes. 
    // 
    // Min and Max were improperly typed as int when they should have been 
    // floats.  To preserve backwards compatibility they are still typed as 
    // int and the following two fields enable reading and writing the same 
    // fields as float numbers. In mgo.v3, these fields will be dropped and 
    // Min/Max will become floats. 
    Min, Max   int 
    Minf, Maxf float64 
    BucketSize float64 
    Bits       int 
 
    // Properties for text indexes. 
    DefaultLanguage  string 
    LanguageOverride string 
 
    // Weights defines the significance of provided fields relative to other 
    // fields in a text index. The score for a given word in a document is derived 
    // from the weighted sum of the frequency for each of the indexed fields in 
    // that document. The default field weight is 1. 
    Weights map[string]int 
 
    // Collation defines the collation to use for the index. 
    Collation *Collation 
} 

顺便说一句，关于golang，有godoc.org和go-serach.org可以搜索go libs，他们通常比谷歌好。