GRAYLOG - Chapter 6, Exercise 3 Solution
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Matching Every Subcategory Under CC.Bullhorn

PROBLEM
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Write a query, using this chapter's own real field and its trailing-
wildcard behavior, that matches every legacy Perl/CGI log line
categorized anywhere under CC.Bullhorn.

SOLUTION
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This chapter's own real field is categoryName, using a dot-joined
structure (example given: CC.Bullhorn.DB). The chapter noted this
structure supports a trailing wildcard the same way class does (per
Chapter 1's own trailing-wildcard-only rule):

    categoryName:CC.Bullhorn.*

ANSWER: categoryName:CC.Bullhorn.*

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WHY THIS WORKS AS AN ANSWER

This is a direct application of this chapter's own real worked example
(categoryName:CC.Bullhorn.* was given as the exact illustration of
matching every subcategory under CC.Bullhorn at once), which itself
relies on Chapter 1's own trailing-wildcard rule - since the wildcard
sits at the END of a known, literal prefix (CC.Bullhorn.), it's a
genuinely valid trailing wildcard, not the unsupported leading kind.