ingest: Dissect processor and lib for 6x #33422
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The dissect library will be used for the ingest node as an alternative
to Grok to split a string based on a pattern. Dissect differs from
Grok such that regular expressions are not used to split the string.
Note - Regular expressions are used during construction of the
objects, but not in the hot path.
A dissect pattern takes the form of: '%{a} %{b},%{c}' which is
composed of 3 keys (a,b,c) and two delimiters (space and comma).
This dissect pattern will match a string of the form: 'foo bar,baz'
and will result a key/value pairing of 'a=foo, b=bar, and c=baz'.
See the comments in DissectParser for a full explanation.
This commit does not include the ingest node processor that will consume
it. However, the consumption should be a trivial mapping between the
key/value pairing returned by the parser and the key/value pairing
needed for the IngestDocument.
The ingest node dissect processor is an alternative to Grok to split a string based on a pattern. Dissect differs from Grok such that regular expressions are not used to split the string. Dissect can be used to parse a source text field with a simpler pattern, and is often faster the Grok for basic string parsing. This processor uses the dissect library which does most of the work.
This change also includes placing the bytes processor in the correct order (helps to avoid merge conflict when back patching processors)
jakelandis
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Backport to 6.x (to run CI).