I have a set of data where the field "system" can either have a value or doesn't exist at all.
The queries NOT _exists_: system and system: value works fine. However, as soon as I try to combine them at a single query NOT _exists_: system OR system: value, ES returns 0 results.
What's wrong with the query and how can I get the desired results?
When using multiple boolean operators, it's a good idea to use parentheses as these operators do not honor the usual precedence rules. Try writing your query like this:
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