使用“在Solr中创建特性”；“微软学习对数据集进行排名”；

我是Solr的新手，我想获得一些特性。我有一个示例

feature.json

，如下所示：

[ 
   {
    "store": "myfeature_store",
    "name" : "originalScore",
    "class" : "org.apache.solr.ltr.feature.OriginalScoreFeature",
    "params" : {}
   },
   {
    "store": "myfeature_store",
    "name" : "titleLength",
    "class" : "org.apache.solr.ltr.feature.FieldLengthFeature",
    "params" : {
    "field":"title" 
     }
   },
   {
    "store": "myfeature_store",
    "name" : "contentLength",
    "class" : "org.apache.solr.ltr.feature.FieldLengthFeature",
    "params" : {
    "field":"content" 
     }
   }, 
   {
   "store": "myfeature_store",
   "name": "titleScore",
   "class": "org.apache.solr.ltr.feature.SolrFeature",
   "params": {
       "q":"{!dismax qf=title} ${query}"
   }
   },
   {
   "store": "myfeature_store",
   "name": "contentScore",
   "class": "org.apache.solr.ltr.feature.SolrFeature",
   "params": {
       "q":"{!dismax qf=content} ${query}"
   }
   }, 
   {
   "store": "myfeature_store",
   "name": "freshness",
   "class": "org.apache.solr.ltr.feature.SolrFeature",
   "params" : {
           "q" : "{!func}recip( ms(NOW, lastModified), 3.16e-11, 1, 1)"
   }
   }
]

我想在“Microsoft学习对数据集进行排名”（Microsoft Learning to Rank Data Sets）（）方面对SVM进行培训。它包含136个功能。如何使用数据集中提供的特性制作

feature.json

？我找不到任何有用的教程