mongoc_index_opt_t(3) on Linux
The text 0bf367553908, as Debian 9 (Stretch) shipped it.
#include <mongoc.h> typedef struct { bool is_initialized; bool background; bool unique; const char *name; bool drop_dups; bool sparse; int32_t expire_after_seconds; int32_t v; const bson_t *weights; const char *default_language; const char *language_override; mongoc_index_opt_geo_t *geo_options; mongoc_index_opt_storage_t *storage_options; const bson_t *partial_filter_expression; void *padding[5]; } mongoc_index_opt_t;