private com.google.protobuf.SingleFieldBuilderV3<
              com.google.storagetransfer.v1.proto.TransferTypes.AgentPool,
              com.google.storagetransfer.v1.proto.TransferTypes.AgentPool.Builder,
              com.google.storagetransfer.v1.proto.TransferTypes.AgentPoolOrBuilder>
          getAgentPoolFieldBuilder() {
        if (agentPoolBuilder_ == null) {
          agentPoolBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.storagetransfer.v1.proto.TransferTypes.AgentPool,
                  com.google.storagetransfer.v1.proto.TransferTypes.AgentPool.Builder,
                  com.google.storagetransfer.v1.proto.TransferTypes.AgentPoolOrBuilder>(
                  getAgentPool(), getParentForChildren(), isClean());
          agentPool_ = null;
        }
        return agentPoolBuilder_;
      }
<pre>
Required. The agent pool to create.
</pre>

<code>
.google.storagetransfer.v1.AgentPool agent_pool = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferProto.java