default void preScannerClose(ObserverContext<? extends RegionCoprocessorEnvironment> c,
    InternalScanner s) throws IOException {
  }
Called before the client closes a scanner.
<p>
Call CoprocessorEnvironment#bypass to skip default actions. If 'bypass' is set, we skip out on
calling any subsequent chained coprocessors.
@param c the environment provided by the region server
@param s the scanner
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionObserver.java