Indexes
Indexes are per collection
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B-tree indexes
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_id is indexed (and unique)
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Single Field
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Compund-key indexes
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Multi-key indexes (indexing each element of an array)
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Geospatial Index
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Text Indexes (beta)
If there is an array of values (eg. tags) then the specific document will be indexed by each one of the values in that array. "Fake full-text indexing."