feat: update legacy escape hatch to return V2 admin clients

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/admin/v2/BigtableInstanceAdminClient.java

@@ -125,7 +125,7 @@
 public final class BigtableInstanceAdminClient implements AutoCloseable {
   private final String projectId;
   private final BigtableInstanceAdminStub stub;
-  private final BaseBigtableInstanceAdminClient baseClient;
+  private final BigtableInstanceAdminClientV2 baseClient;
 
   /** Constructs an instance of BigtableInstanceAdminClient with the given project ID. */
   public static BigtableInstanceAdminClient create(@Nonnull String projectId) throws IOException {
@@ -148,7 +148,7 @@ private BigtableInstanceAdminClient(
       @Nonnull String projectId, @Nonnull BigtableInstanceAdminStub stub) {
     this.projectId = projectId;
     this.stub = stub;
-    this.baseClient = BaseBigtableInstanceAdminClient.create(stub);
+    this.baseClient = BigtableInstanceAdminClientV2.create(stub);
   }
 
   /** Gets the project ID this client is associated with. */
@@ -160,7 +160,7 @@ public String getProjectId() {
    * Returns the modern autogenerated client. This provides access to the newest features and
    * proto-based methods.
    */
-  public BaseBigtableInstanceAdminClient getBaseClient() {
+  public BigtableInstanceAdminClientV2 getBaseClient() {
     return baseClient;
   }
 

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/admin/v2/BigtableTableAdminClient.java

@@ -169,7 +169,7 @@ public final class BigtableTableAdminClient implements AutoCloseable {
   private final EnhancedBigtableTableAdminStub stub;
   private final String projectId;
   private final String instanceId;
-  private final BaseBigtableTableAdminClient baseClient;
+  private final BigtableTableAdminClientV2 baseClient;
 
   /** Constructs an instance of BigtableTableAdminClient with the given project and instance IDs. */
   public static BigtableTableAdminClient create(
@@ -209,7 +209,12 @@ private BigtableTableAdminClient(
     this.projectId = projectId;
     this.instanceId = instanceId;
     this.stub = stub;
-    this.baseClient = BaseBigtableTableAdminClient.create(stub);
+    this.baseClient =
+        new BigtableTableAdminClientV2(
+            stub,
+            (com.google.cloud.bigtable.admin.v2.stub.AwaitConsistencyCallable)
+                stub.awaitConsistencyCallable(),
+            stub.awaitOptimizeRestoredTableCallable());
   }
 
   /** Gets the project ID of the instance whose tables this client manages. */
@@ -226,7 +231,7 @@ public String getInstanceId() {
    * Returns the modern autogenerated client. This provides access to the newest features and
    * proto-based methods.
    */
-  public BaseBigtableTableAdminClient getBaseClient() {
+  public BigtableTableAdminClientV2 getBaseClient() {
     return baseClient;
   }
 

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/admin/v2/BigtableTableAdminClientV2.java

@@ -35,7 +35,6 @@
 import com.google.cloud.bigtable.admin.v2.models.ConsistencyRequest;
 import com.google.cloud.bigtable.admin.v2.models.OptimizeRestoredTableOperationToken;
 import com.google.cloud.bigtable.admin.v2.models.RestoredTableResult;
-import com.google.cloud.bigtable.admin.v2.stub.AwaitConsistencyCallable;
 import com.google.cloud.bigtable.admin.v2.stub.BigtableTableAdminStub;
 import com.google.cloud.bigtable.admin.v2.stub.BigtableTableAdminStubSettings;
 import com.google.common.base.Strings;
@@ -57,7 +56,8 @@
  * generator cannot handle natively (e.g., chained Long Running Operations, Consistency Polling).
  */
 public class BigtableTableAdminClientV2 extends BaseBigtableTableAdminClient {
-  private final AwaitConsistencyCallable awaitConsistencyCallable;
+  private final com.google.cloud.bigtable.admin.v2.stub.AwaitConsistencyCallable
+      awaitConsistencyCallable;
   private final OperationCallable<Void, Empty, OptimizeRestoredTableMetadata>
       optimizeRestoredTableOperationBaseCallable;
 
@@ -79,16 +79,16 @@ protected BigtableTableAdminClientV2(BigtableTableAdminStub stub) {
   @com.google.common.annotations.VisibleForTesting
   BigtableTableAdminClientV2(
       BigtableTableAdminStub stub,
-      AwaitConsistencyCallable awaitConsistencyCallable,
+      com.google.cloud.bigtable.admin.v2.stub.AwaitConsistencyCallable awaitConsistencyCallable,
       OperationCallable<Void, Empty, OptimizeRestoredTableMetadata>
           optimizeRestoredTableOperationBaseCallable) {
     super(stub);
     this.awaitConsistencyCallable = awaitConsistencyCallable;
     this.optimizeRestoredTableOperationBaseCallable = optimizeRestoredTableOperationBaseCallable;
   }
 
-  private AwaitConsistencyCallable createAwaitConsistencyCallable(
-      BigtableTableAdminStubSettings settings) throws IOException {
+  private com.google.cloud.bigtable.admin.v2.stub.AwaitConsistencyCallable
+      createAwaitConsistencyCallable(BigtableTableAdminStubSettings settings) throws IOException {
     ClientContext clientContext = ClientContext.create(settings);
     // TODO(igorbernstein2): expose polling settings
     RetrySettings pollingSettings =
@@ -103,7 +103,7 @@ private AwaitConsistencyCallable createAwaitConsistencyCallable(
             .setRpcTimeoutMultiplier(1.0)
             .build();
 
-    return AwaitConsistencyCallable.create(
+    return com.google.cloud.bigtable.admin.v2.stub.AwaitConsistencyCallable.create(
         getStub().generateConsistencyTokenCallable(),
         getStub().checkConsistencyCallable(),
         clientContext,
@@ -199,11 +199,6 @@ public static final BigtableTableAdminClientV2 create(BaseBigtableTableAdminSett
     return new BigtableTableAdminClientV2(settings);
   }
 
-  /** Constructs an instance of BigtableTableAdminClientV2 with the given stub. */
-  public static final BigtableTableAdminClientV2 create(BigtableTableAdminStub stub) {
-    return new BigtableTableAdminClientV2(stub);
-  }
-
   /**
    * Awaits the completion of the "Optimize Restored Table" operation.
    *
@@ -322,8 +317,9 @@ private UnaryCallable<ConsistencyRequest, Void> getAwaitConsistencyCallable() {
       return awaitConsistencyCallable;
     }
     throw new IllegalStateException(
-        "AwaitConsistencyCallable not initialized. BigtableTableAdminClientV2 must be "
-            + "initialized via settings to use this functionality.");
+        "com.google.cloud.bigtable.admin.v2.stub.AwaitConsistencyCallable not initialized."
+            + " BigtableTableAdminClientV2 must be initialized via settings to use this"
+            + " functionality.");
   }
 
   private OperationCallable<Void, Empty, OptimizeRestoredTableMetadata>