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Additional information:

Message:
{"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.common.util.concurrent.TimedRunnable@721f07dc on QueueResizingEsThreadPoolExecutor[name = hdoOf-g/search, queue capacity = 1000, min queue capacity = 1000, max queue capacity = 1000, frame size = 2000, targeted response rate = 1s, task execution EWMA = 960.4micros, adjustment amount = 50, org.elasticsearch.common.util.concurrent.QueueResizingEsThreadPoolExecutor@65f3cbb5[Running, pool size = 19, active threads = 19, queued tasks = 1258, completed tasks = 15510778169]]"}},"status":503}