kibana查询报错es_rejected_execution_exception

kibana中打开一个dashboard，结果报错：
Visualize: Request to Elasticsearch failed: {"error":{"root_cause":[],"type":"search_phase_execution_exception","reason":"","phase":"fetch","grouped":true,"failed_shards":[],"caused_by":{"type":"es_rejected_execution_exception","reason":"rejected execution of org.elasticsearch.action.search.FetchSearchPhase$1@16fc2268 on EsThreadPoolExecutor[search, queue capacity = 1000, org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor@2c47d10c[Running, pool size = 13, active threads = 13, queued tasks = 1000, completed tasks = 202556]]"}},"status":503}

使用 /_nodes/stats/thread_pool?pretty 检查search的状态
查询前：
rejected    5744
largest    13
completed    217214

查询后：
rejected    6034
largest    13
completed    223036

就60个index，打开一次dashboard会有5000次查询？
哪位大神给点帮助吧！！