RediSearch FT.SEARCH 命令中的 FRAGS 参数有什么作用？

Question

我查看了 RediSearch documentation 和下面 FT.SEARCH 的语法：

FT.SEARCH {index} {query} [NOCONTENT] [VERBATIM] [NOSTOPWORDS] [WITHSCORES] [WITHPAYLOADS] [WITHSORTKEYS]
  [FILTER {numeric_field} {min} {max}] ...
  [GEOFILTER {geo_field} {lon} {lat} {raius} m|km|mi|ft]
  [INKEYS {num} {key} ... ]
  [INFIELDS {num} {field} ... ]
  [RETURN {num} {field} ... ]
  [SUMMARIZE [FIELDS {num} {field} ... ] [FRAGS {num}] [LEN {fragsize}] [SEPARATOR {separator}]]
  [HIGHLIGHT [FIELDS {num} {field} ... ] [TAGS {open} {close}]]
  [SLOP {slop}] [INORDER]
  [LANGUAGE {language}]
  [EXPANDER {expander}]
  [SCORER {scorer}]
  [PAYLOAD {payload}]
  [SORTBY {field} [ASC|DESC]]
  [LIMIT offset num]

我在任何地方都找不到 FRAGS 的描述。 RediSearch FT.SEARCH 命令中的 FRAGS 参数有什么作用？ {num} 参数有限制吗？

Answer 1

片段是搜索结果的子字符串，其中包含与搜索词相关的上下文信息；例如，在搜索 "Redis" 时，文档中的片段可能是

"found. Users liked Redis more than other..."

这是 summarization 功能的一部分

RediSearch FT.SEARCH 命令中的 FRAGS 参数有什么作用？

What FRAGS argument does in RediSearch FT.SEARCH command?

redisearch