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* GH-3647: Use remoteDirExpression in MV command Fixes https://github.com/spring-projects/spring-integration/issues/3647 To simplify a source and renameTo remote file expressions, the `remoteDirectoryExpression` is consulted now, when they are not full paths. This is useful when we want just to rename a remote file in some dir * * Add JavaDoc for `getDirectoryExpressionProcessor()` * Fix language in docs