public Builder clearPrimaryInstance() {
      bitField0_ = (bitField0_ & ~0x00000002);
      primaryInstance_ = null;
      if (primaryInstanceBuilder_ != null) {
        primaryInstanceBuilder_.dispose();
        primaryInstanceBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Optional. Details of the primary instance that is used as the replication
source for this secondary instance.

This field is only set for a secondary instance.
</pre>

<code>
.google.cloud.memorystore.v1.CrossInstanceReplicationConfig.RemoteInstance primary_instance = 2 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/CrossInstanceReplicationConfig.java