springboot ElasticSearch如何配置自定义转换器ElasticsearchCustomConversions

//org.springframework.boot.autoconfigure.data.elasticsearch
@Import({ ElasticsearchDataConfiguration.BaseConfiguration.class,
		ElasticsearchDataConfiguration.RestClientConfiguration.class,
		ElasticsearchDataConfiguration.ReactiveRestClientConfiguration.class })
public class ElasticsearchDataAutoConfiguration {
}

//org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataConfiguration.BaseConfiguration
@Bean
@ConditionalOnMissingBean
ElasticsearchConverter elasticsearchConverter(SimpleElasticsearchMappingContext mappingContext) {
    return new MappingElasticsearchConverter(mappingContext);
}

public MappingElasticsearchConverter(
    MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext) {
    this(mappingContext, null);
}
public MappingElasticsearchConverter(
    MappingContext<? extends ElasticsearchPersistentEntity<?>, ElasticsearchPersistentProperty> mappingContext,
    @Nullable GenericConversionService conversionService) {
    Assert.notNull(mappingContext, "MappingContext must not be null!");
    this.mappingContext = mappingContext;
    this.conversionService = conversionService != null ? conversionService : new DefaultConversionService();
    this.typeMapper = ElasticsearchTypeMapper.create(mappingContext);
}

/**
	 * Set the {@link CustomConversions} to be applied during the mapping process. <br />
	 * Conversions are registered after {@link #afterPropertiesSet() bean initialization}.
	 *
	 * @param conversions must not be {@literal null}.
	 */
public void setConversions(CustomConversions conversions) {
    this.conversions = conversions;
}

@WritingConverter
static class TimestampToLong implements Converter<Timestamp, Long> {
    @Override
    public Long convert(Timestamp source) {
        return source.getTime();
    }
}
@ReadingConverter
static class LongToTimestamp implements Converter<Long, Timestamp> {
    @Override
    public Timestamp convert(Long source) {
        return new Timestamp(source);
    }
}

@Bean
ElasticsearchConverter elasticsearchConverter(SimpleElasticsearchMappingContext mappingContext) {
    DefaultConversionService defaultConversionService = new DefaultConversionService();
    defaultConversionService.addConverter(new TimestampToLong());
    defaultConversionService.addConverter(new LongToTimestamp());
    return new MappingElasticsearchConverter(mappingContext, defaultConversionService);
}

@Bean
public ElasticsearchCustomConversions elasticsearchCustomConversions() {
    return new ElasticsearchCustomConversions(
        Arrays.asList(new TimestampToLong(), new LongToTimestamp()));
}
@Bean
public ElasticsearchConverter elasticsearchConverter(SimpleElasticsearchMappingContext mappingContext, ElasticsearchCustomConversions elasticsearchCustomConversions) {
    MappingElasticsearchConverter mappingElasticsearchConverter = new MappingElasticsearchConverter(mappingContext);
    mappingElasticsearchConverter.setConversions(elasticsearchCustomConversions);
    return mappingElasticsearchConverter;
}