@java.lang.Override
  public boolean hasSystemInstruction() {
    return ((bitField0_ & 0x00000001) != 0);
  }
<pre>
Optional. The user provided system instructions for the model.
Note: only text should be used in parts and content in each part will be in
a separate paragraph.
</pre>

<code>
optional .google.cloud.vertexai.v1.Content system_instruction = 8 [(.google.api.field_behavior) = OPTIONAL];
</code>

@return Whether the systemInstruction field is set.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerateContentRequest.java