How Customer Profiles adds keys to the index for lookups
The following diagram shows how Customer Profiles processes the standard identifiers to determine whether to persist the key.

The flowchart shows the following steps:
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Does the key have
LOOKUP_ONLY
specified?-
If Yes, don't persist the key.
-
-
If No, does the key have
NEW_ONLY
specified?-
If No, save the key in the index to allow it to be used for lookups.
-
-
If Yes, has ingesting the object results in creating a new profile?
-
If Yes, save the key in the index to allow it to be used for lookups.
-
If No, don't persist the key in the index for future lookups.
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