partial sync with main (without the routing part)

ortools/sat/samples/SearchForAllSolutionsSampleSat.java

@@ -18,6 +18,7 @@ import com.google.ortools.Loader;
 import com.google.ortools.sat.CpModel;
 import com.google.ortools.sat.CpSolver;
 import com.google.ortools.sat.CpSolverSolutionCallback;
+import com.google.ortools.sat.CpSolverStatus;
 import com.google.ortools.sat.IntVar;
 
 /** Code sample that solves a model and displays all solutions. */
@@ -74,7 +75,7 @@ public class SearchForAllSolutionsSampleSat {
     // Tell the solver to enumerate all solutions.
     solver.getParameters().setEnumerateAllSolutions(true);
     // And solve.
-    solver.solve(model, cb);
+    CpSolverStatus unusedStatus = solver.solve(model, cb);
     // [END solve]
 
     System.out.println(cb.getSolutionCount() + " solutions found.");