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Path Hierarchy Tokenizer

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Path Hierarchy Tokenizer

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The path_hierarchy tokenizer takes a hierarchical value like a filesystem path, splits on the path separator, and emits a term for each component in the tree.

Example output

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POST _analyze
{
  "tokenizer": "path_hierarchy",
  "text": "/one/two/three"
}

The above text would produce the following terms:

[ /one, /one/two, /one/two/three ]

Configuration

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The path_hierarchy tokenizer accepts the following parameters:

`delimiter`	The character to use as the path separator. Defaults to `/`.
`replacement`	An optional replacement character to use for the delimiter. Defaults to the `delimiter`.
`buffer_size`	The number of characters read into the term buffer in a single pass. Defaults to `1024`. The term buffer will grow by this size until all the text has been consumed. It is advisable not to change this setting.
`reverse`	If set to `true`, emits the tokens in reverse order. Defaults to `false`.
`skip`	The number of initial tokens to skip. Defaults to `0`.

Example configuration

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In this example, we configure the path_hierarchy tokenizer to split on - characters, and to replace them with /. The first two tokens are skipped:

PUT my_index
{
  "settings": {
    "analysis": {
      "analyzer": {
        "my_analyzer": {
          "tokenizer": "my_tokenizer"
        }
      },
      "tokenizer": {
        "my_tokenizer": {
          "type": "path_hierarchy",
          "delimiter": "-",
          "replacement": "/",
          "skip": 2
        }
      }
    }
  }
}

POST my_index/_analyze
{
  "analyzer": "my_analyzer",
  "text": "one-two-three-four-five"
}

The above example produces the following terms:

[ /three, /three/four, /three/four/five ]

If we were to set reverse to true, it would produce the following:

[ one/two/three/, two/three/, three/ ]

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