public Builder clearInstance() {
      instance_ = getDefaultInstance().getInstance();
      bitField0_ = (bitField0_ & ~0x00000004);
      onChanged();
      return this;
    }
<pre>
Output only. The full resource path of the instance the backup collection
belongs to. Example:
projects/{project}/locations/{location}/instances/{instance}
</pre>

<code>
string instance = 4 [(.google.api.field_behavior) = OUTPUT_ONLY, (.google.api.resource_reference) = { ... }
</code>

@return This builder for chaining.
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/BackupCollection.java