public Builder putEngineConfigs(java.lang.String key, java.lang.String value) {
      if (key == null) {
        throw new NullPointerException("map key");
      }
      if (value == null) {
        throw new NullPointerException("map value");
      }
      internalGetMutableEngineConfigs().getMutableMap().put(key, value);
      bitField0_ |= 0x00020000;
      return this;
    }
<pre>
Optional. User-provided engine configurations for the instance.
</pre>

<code>
map&lt;string, string&gt; engine_configs = 16 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/Instance.java