in ecs-logging-core/src/main/java/co/elastic/logging/EcsJsonSerializer.java [194:205]
public static void serializeMDC(StringBuilder builder, Map<String, ?> properties) {
if (properties != null && !properties.isEmpty()) {
for (Map.Entry<String, ?> entry : properties.entrySet()) {
builder.append('\"');
String key = entry.getKey();
JsonUtils.quoteAsString(key, builder);
builder.append("\":\"");
JsonUtils.quoteAsString(toNullSafeString(String.valueOf(entry.getValue())), builder);
builder.append("\",");
}
}
}