GRAYLOG - Chapter 7, Exercise 2 Solution
==========================================================
Excluding Debug-Level Messages with the Minus Operator

PROBLEM
-------
Write a query, using this chapter's own minus-operator syntax, that
finds all ws-lite activity except debug-level (7) messages.

SOLUTION
--------
This chapter's own real minus-operator example excluded level 7 from
scout's own activity:

    service:scout -level:7

Substituting ws-lite for scout, using the identical real pattern:

    service:ws-lite -level:7

ANSWER: service:ws-lite -level:7

----
WHY THIS WORKS AS AN ANSWER

This is a direct substitution into this chapter's own real worked
minus-operator example. The minus operator was specifically requested
over NOT here because, per this chapter's own material, NOT requires at
least one other term to accompany it - the minus form is the more
flexible of the two real exclusion syntaxes, usable in more query
shapes without that same restriction.