anchor.diff:  (derived from a single random master seed).
   
   --------------------------------------------------
  -./gradlew test -Dtests.iters=N -Dtests.class=*.ClassName
  +./gradlew :server:test -Dtests.iters=N --tests org.elasticsearch.package.ClassName
   --------------------------------------------------
   
   === Repeats _all_ tests of ClassName N times.
  
positive.code: method-level (0xbeef) seed.
  
  ------------------------------------------------------------------------
  ./gradlew test -Dtests.iters=N -Dtests.class=*.ClassName -Dtests.seed=DEAD:BEEF
  ------------------------------------------------------------------------
  
  === Repeats a given test N times
  
negative.code: ending in a glob is necessary to ensure iterations are run).
  
  -------------------------------------------------------------------------
  ./gradlew :server:test -Dtests.iters=N --tests org.elasticsearch.package.ClassName.methodName
  -------------------------------------------------------------------------
  
  Repeats N times but skips any tests after the first failure or M initial failures.
  
  -------------------------------------------------------------
  ./gradlew test -Dtests.iters=N -Dtests.failfast=true ...
  ./gradlew test -Dtests.iters=N -Dtests.maxfailures=M ...
  -------------------------------------------------------------
  
  === Test groups.
  