typedef enum {

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                          MONGOC_UPDATE_FLAGS_T(3)

       These  flags  correspond  to  the MongoDB wire protocol. They may be bitwise or'd together. The allow for
       modifying the way an update is performed in the MongoDB server.

                        ┌────────────────────────────┬───────────────────────────────────────┐
                        │ MONGOC_UPDATE_NONE         │ No update flags set.                  │
                        ├────────────────────────────┼───────────────────────────────────────┤
                        │ MONGOC_UPDATE_UPSERT       │ If an upsert should be performed.     │
                        ├────────────────────────────┼───────────────────────────────────────┤
                        │ MONGOC_UPDATE_MULTI_UPDATE │ If  more  than  a   single   matching │
                        │                            │ document   should   be   updated.  By │
                        │                            │ default only the  first  document  is │
                        │                            │ updated.                              │
                        ├────────────────────────────┼───────────────────────────────────────┤
                        │ MONGOC_UPDATE_NO_VALIDATE  │ Do   not  perform  client  side  BSON │
                        │                            │ validations   when   performing    an │
                        │                            │ update. This is useful if you already │
                        │                            │ know your BSON documents are valid.   │
                        └────────────────────────────┴───────────────────────────────────────┘

          typedef enum {
             MONGOC_UPDATE_NONE = 0,
             MONGOC_UPDATE_UPSERT = 1 << 0,
             MONGOC_UPDATE_MULTI_UPDATE = 1 << 1,
          } mongoc_update_flags_t;

          #define MONGOC_UPDATE_NO_VALIDATE (1U << 31)