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3051c37f92
Prior to this change the named pipes that connect the ML C++ processes to the Elasticsearch JVM were all opened before any of them were read from or written to. This created a problem, where if the C++ process logged more messages between opening the log pipe and opening the last pipe to be connected than there was space for in the named pipe's buffer then the C++ process would block. This would mean it never got as far as opening the last named pipe, so the JVM would never get as far as reading from the log pipe, hence a deadlock. This change alters the connection order so that the JVM starts reading from the logging pipe immediately after opening it so that if the C++ process logs messages while opening the other named pipes they are captured in a timely manner and there is no danger of a deadlock. Backport of #56632
Elastic License Functionality
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