private void ensureBackupFilesIsMutable() {
      if (!((bitField0_ & 0x00000080) != 0)) {
        backupFiles_ =
            new java.util.ArrayList<com.google.cloud.memorystore.v1.BackupFile>(backupFiles_);
        bitField0_ |= 0x00000080;
      }
    }
<pre>
Output only. valkey-7.5/valkey-8.0, etc.
</pre>

<code>string engine_version = 7 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@param value The bytes for engineVersion to set.
@return This builder for chaining.
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/Backup.java