1. A computer-implemented method for window management in a stream computing environment to process a stream of tuples using a window of the stream computing environment the method comprising: receiving a stream of tuples to be processed by a set of processing elements which operates on a set of computer nodes; detecting in real-time a set of tuples that correspond to a window of a stream computing environment, wherein the set of tuples has a set of data; processing using the set of processing elements on the set of computer nodes the stream of tuples; determining in real-time based on the set of data of the set of tuples, a confidence factor related to a set of expected result data for the set of tuples that correspond to the window of the stream computing environment; configuring in real-time, based on a set of operator data of a set of stream operators, the window in the stream computing environment to process the stream of tuples; determining, based on a set of downstream operator data of a downstream operator of the set of stream operators, a threshold confidence for utilization to configure the window in the stream computing environment to process the stream of tuples; comparing the confidence factor with the threshold confidence; resolving that the confidence factor exceeds the threshold confidence; and closing, in response to resolving that the confidence factor exceeds the threshold confidence, the window.