- Remove guava dependency (in modules core-client and core-shared)
 - Remove gson (keep as optional in module core-client)
 - Add /node/summary Rest action

 - Security: fix security rule for /_read URL
 - Add missing i18n resource files (in gchange plugin)

- ThreadPool : delegate to default ES thread pool when possible

- Add cache on HttpClient, by timeout
- Fix maven conf to run ES node using -DskipAssembly
- Add new index group/record
- Synchro: log stats insert/update

- allow search rest access on user event
- user event : add pubkeys AND names on TX events

- Add user event on blockchain changes

- ES: simplify UserEvent management

 - elasticsearch: Add event service

- add missing license header
- Add security rule on currency BEFORE starting block indexation