All shards failed-503error

elk version:5.6.11

Discover: Request to Elasticsearch failed: {"error":{"root_cause":,"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":},"status":503}

Error: Request to Elasticsearch failed: {"error":{"root_cause":,"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":},"status":503}
at http://120.25.94.79:65532/bundles/kibana.bundle.js?v=15647:29:12752
at Function.Promise.try (http://120.25.94.79:65532/bundles/commons.bundle.js?v=15647:83:22246)
at http://120.25.94.79:65532/bundles/commons.bundle.js?v=15647:83:21602
at Array.map ()
at Function.Promise.map (http://120.25.94.79:65532/bundles/commons.bundle.js?v=15647:83:21557)
at callResponseHandlers (http://120.25.94.79:65532/bundles/kibana.bundle.js?v=15647:29:12368)
at http://120.25.94.79:65532/bundles/kibana.bundle.js?v=15647:29:623
at processQueue (http://120.25.94.79:65532/bundles/commons.bundle.js?v=15647:38:23621)
at http://120.25.94.79:65532/bundles/commons.bundle.js?v=15647:38:23888
at Scope.$eval (http://120.25.94.79:65532/bundles/commons.bundle.js?v=15647:39:4619)

pls tell me what error happen?

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