Flags for query operations
typedef enum {
   MONGOC_QUERY_NONE = 0,
   MONGOC_QUERY_TAILABLE_CURSOR = 1 << 1,
   MONGOC_QUERY_SECONDARY_OK = 1 << 2,
   MONGOC_QUERY_OPLOG_REPLAY = 1 << 3,
   MONGOC_QUERY_NO_CURSOR_TIMEOUT = 1 << 4,
   MONGOC_QUERY_AWAIT_DATA = 1 << 5,
   MONGOC_QUERY_EXHAUST = 1 << 6,
   MONGOC_QUERY_PARTIAL = 1 << 7,
} mongoc_query_flags_t;
 
 
These flags correspond to the MongoDB wire protocol. They may be
    bitwise or'd together. They may modify how a query is performed in the
    MongoDB server.
  
    | MONGOC_QUERY_NONE | Specify no query flags. | 
  
    | MONGOC_QUERY_TAILABLE_CURSOR | Cursor will not be closed when the last data is retrieved. You can
      resume this cursor later. | 
  
    | MONGOC_QUERY_SECONDARY_OK | Allow query of replica set secondaries. | 
  
    | MONGOC_QUERY_OPLOG_REPLAY | Used internally by MongoDB. | 
  
    | MONGOC_QUERY_NO_CURSOR_TIMEOUT | The server normally times out an idle cursor after an inactivity period
      (10 minutes). This prevents that. | 
  
    | MONGOC_QUERY_AWAIT_DATA | Use with MONGOC_QUERY_TAILABLE_CURSOR. Block rather than returning no
      data. After a period, time out. | 
  
    | MONGOC_QUERY_EXHAUST | Stream the data down full blast in multiple "reply" packets.
      Faster when you are pulling down a lot of data and you know you want to
      retrieve it all. Only applies to cursors created from a find operation
      (i.e. mongoc_collection_find()). | 
  
    | MONGOC_QUERY_PARTIAL | Get partial results from mongos if some shards are down (instead of
      throwing an error). | 
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