elasticsearch 单机模式下 分片shard 是5个？我只创建了【product和】不应该是1个shard吗？

Question

{
"cluster_name": "elastic",
"status": "yellow",
"timed_out": false,
"number_of_nodes": 1,
"number_of_data_nodes": 1,
** "active_primary_shards": 6,
"active_shards": 6,**

"relocating_shards": 0,
"initializing_shards": 0,
"unassigned_shards": 6,
"delayed_unassigned_shards": 0,
"number_of_pending_tasks": 0,
"number_of_in_flight_fetch": 0,
"task_max_waiting_in_queue_millis": 0,
"active_shards_percent_as_number": 50
}