How to override LogEventJacksonJsonMixIn properly? about log4j2-elasticsearch HOT 2 CLOSED

Unfortunately, Jackson MixIns don't work this way.

However, in this case, there are workarounds:

1. In order to use Instant as @timestamp , this worked for me (note, that @JsonIgnore(false) has to be present to include getter that was ignored in LogEventJacksonJsonMixIn):

    @JsonProperty("@timestamp")
    @JsonIgnore(false)
    @Override
    public abstract Instant getInstant();

2. If you want to append additional properties, you can smuggle them using Log4j2 ThreadContext and:

• use LogEvent.getContextMap if you want to decorate root level of document.source:

    @JsonAnyGetter
    @JsonIgnore(false)
    @Override
    public abstract Map<String, String> getContextMap();

NOTE: it's deprecated, so if it gets removed, switch to getContextData

• use LogEvent.getContextData if you don't care about nesting:

    @JsonSerialize(using = ContextDataSerializer.class)
    @JsonIgnore(false)
    @Override
    public abstract ReadOnlyStringMap getContextData();

ContextDataSerializer is considered private in log4j-core:jar - another argument for a custom one.

from log4j2-elasticsearch.

If you want to remove the "contextData" level in the generated json :

Add @JsonUnwrapped annotation on the getter getContextData() in the mixins class.
And important, in your custom serializer of getContextData(), yes you need one, add the following code :

    @Override
    public boolean isUnwrappingSerializer() {
        return true;
    }

from log4j2-elasticsearch.