WiredTiger creationString in collstats contains non-collection level options

backup_test:PRIMARY> use wt_test switched to db wt_test backup_test:PRIMARY> db.createCollection("source") { "ok" : 1 } backup_test:PRIMARY> var creationString = db.runCommand({"collstats":"source"})["wiredTiger"]["creationString"] backup_test:PRIMARY> creationString allocation_size=4KB,app_metadata=(formatVersion=1),block_allocation=best,block_compressor=snappy,cache_resident=0,checkpoint=,checkpoint_lsn=,checksum=uncompressed,collator=,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=16,internal_item_max=0,internal_key_max=0,internal_key_truncate=,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=1MB,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=0,prefix_compression_min=4,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,value_format=u,version=(major=1,minor=1) backup_test:PRIMARY> db.createCollection("dest", {storageEngine:{wiredTiger:{configString:creationString}}}) { "errmsg" : "exception: 22: Invalid argument", "code" : 2, "ok" : 0 }