This changeset reintroduces automatic n1ql index generation but through
new annotations: QueryIndexed and CompositeQueryIndex (as well as
CompositeQueryIndexes to supply more than one). They are translated
into create index statements and executed at startup if configured
in the config.
Note that automatic index management is disabled by default but can
be overidden with a simple flag on the config override. More features
to come later.
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