This is to remove document data printout from the MissingDocumentKey
exception message which could expose sensitive data if it is caught
and logged by other services, for example. Instead, the child
and parent documents' schema and name are printed, in addition to
the action object in which the path that could not be resolved
in either parent or document is contained.
Change-Id: I07f43e57527d05e98e98e5f80567b97dd2a762f9
e90c0aedf8