private void ensureInstancesIsMutable() {
      if (!((bitField0_ & 0x00000002) != 0)) {
        instances_ = new java.util.ArrayList<com.google.protobuf.Value>(instances_);
        bitField0_ |= 0x00000002;
      }
    }
<pre>
Required. The name of the Endpoint requested to get lists of tokens and
token ids.
</pre>

<code>
string endpoint = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
</code>

@param value The bytes for endpoint to set.
@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ComputeTokensRequest.java