[8.15] [Security Solution][Detection Engine] Fix importing rules with multiple types of exception lists (#198868) #200084
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…le types of exception lists (elastic#198868) ## Summary Fixes elastic#198461 When a rule import file has both single-namespace and namespace-agnostic exception lists, there was a bug in the logic that fetched the existing exception lists after importing them. A missing set of parentheses caused a KQL query that should have read `(A OR B) AND (C OR D)` to be `(A OR B) AND C OR D`, meaning that the logic was satisfied by `D` alone instead of requiring `A` or `B` to be true along with `D`. In this case `A` and `B` are filters on `exception-list` and `exception-list-agnostic` SO attributes so that we (should) only be looking at the list container objects, i.e. `exception-list.attributes.list_type: list`. `C` and `D` are filters by `list_id`, e.g. `exception-list.attributes.list_id: (test_list_id)`. Without the extra parentheses around `C OR D`, the query finds both `list` and `item` documents for the list IDs specified in `D`. When the `findExceptionList` logic encounters a list item unexpectedly, it still tries to convert the SO into our internal representation of an exception list with `transformSavedObjectToExceptionList`. Most fields are shared between lists and items, which makes it confusing to debug. However, the `type` of items can only be `simple`, whereas lists have a variety of types. During the conversion, the `type` field of the resulting object is defaulted to `detection` if the `type` field of the SO doesn't match the allowed list type values. Since the related SDH involved importing a `rule_default` exception list instead, the list types didn't match up when the import route compared the exception list on the rule to import vs the "existing list" (which was actually a list item coerced into a list container schema with `type: detection`) and import fails. (cherry picked from commit 0cc2e56)
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