所有的REST查询必须通过签名令牌签名的方式进行认证，该过程通过对按小写的字母顺序排序的查询参数使用私钥进行签名。
All REST queries must be authenticated by signing the query parameters sorted in lower-case, alphabetical order using the private credential as the signing token.
索引引擎，它负责在统计层面上分析纯文本(由二进制文档派生而来)，然后计算令牌的列表，按使用频率排序。
An indexing engine, which is responsible to statistically analyze the plain text (derived from the binary document) and compute a list of tokens, sorted by frequency.
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