- Use `OptionalEntity<T>` for nullable returns
- Plain classes (no extends/implements)

### Helper
- Stateless utility classes
- Access via `ComponentUtil.getXyzHelper()`
- Named with "Helper" suffix

### DBFlute Generated Code
```
opensearch/{index}/
├── bsentity/, bsbhv/    # Base classes (DO NOT EDIT)
├── exentity/, exbhv/    # Extended classes (customize here)

      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the gonum project nor the names of its authors and
      contributors may be used to endorse or promote products derived from this
      software without specific prior written permission.

    javaVersion > 17
  }
}

apply(plugin = "org.graalvm.buildtools.native")

configure<GraalVMExtension> {
  binaries {
    named("main") {
      imageName = "okcurl"
      mainClass = "okhttp3.curl.MainCommandLineKt"
      if (System.getProperty("os.name").lowercase().contains("windows")) {
        // windows requires a slightly different approach for some things
      } else {
        buildArgs("--no-fallback")

notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
   * Neither the name of Google LLC nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

                CollectionFeature.GENERAL_PURPOSE,
                CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
                CollectionFeature.ALLOWS_NULL_QUERIES,
                MultisetFeature.ENTRIES_ARE_VIEWS)
            .named("EnumMultiset")
            .createTestSuite());
    suite.addTestSuite(EnumMultisetTest.class);
    return suite;
  }

  @AndroidIncompatible // test-suite builders

  @AndroidIncompatible // test-suite builders
  public static Test suite() {
    TestSuite suite = new TestSuite();
    suite.addTest(
        MapTestSuiteBuilder.using(new ImmutableEnumMapGenerator())
            .named("Maps.immutableEnumMap")
            .withFeatures(CollectionSize.ANY, SERIALIZABLE, ALLOWS_NULL_QUERIES)
            .createTestSuite());
    suite.addTestSuite(ImmutableEnumMapTest.class);
    return suite;
  }

                    include '*'
                }
                restTests {
                    includeCore 'foo'
                    includeXpack 'bar'
                }
            }

            tasks.named("copyYamlTestsTask").configure {
                it.substitutions = [ 'replacedValue' : 'replacedWithValue' ]
            }
        """
        String apiCore1 = "foo1.json"
        String apiCore2 = "foo2.json"

 *
 * There are trade-offs when selecting which options to include when negotiating a secure connection
 * to a remote host. Newer TLS options are quite useful:
 *
 *  * Server Name Indication (SNI) enables one IP address to negotiate secure connections for
 *    multiple domain names.
 *
 *  * Application Layer Protocol Negotiation (ALPN) enables the HTTPS port (443) to be used to
 *    negotiate HTTP/2.
 *

    }
  }

  /**
   * Returns the parameter [name] of this media type, or null if this media type does not define
   * such a parameter.
   */
  fun parameter(name: String): String? {
    for (i in parameterNamesAndValues.indices step 2) {
      if (parameterNamesAndValues[i].equals(name, ignoreCase = true)) {
        return parameterNamesAndValues[i + 1]
      }
    }
    return null