Resolve "Create missing service classes"

Closes #16 (closed)

src/main/java/cz/muni/ics/kypo/training/adaptive/config/ObjectMapperConfigElasticsearch.java

+package cz.muni.csirt.kypo.elasticsearch.service.config;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.PropertyNamingStrategy;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * The type Object mapper config elasticsearch.
+ */
+@Configuration
+public class ObjectMapperConfigElasticsearch {
+
+    /**
+     * Object mapper object mapper.
+     *
+     * @return the object mapper
+     */
+    @Bean("objMapperForElasticsearch")
+    public ObjectMapper objectMapper() {
+        ObjectMapper objectMapper = new ObjectMapper();
+        objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
+        objectMapper.registerModule(new JavaTimeModule());
+        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
+        return objectMapper;
+    }
+
+}