[Bug] Attachment.* filters are broken under observable search in v4.0.1

[KaanSK]

Attachment.* filters are broken under observable search in v4.0.1

Request Type

Bug

Work Environment

Question	Answer
OS version (server)	Debian
OS version (client)	Ubuntu, Windows10
TheHive version / git hash	4.0.1
Package Type	DEB, Docker
Browser type & version	All browsers

Problem Description

Under search/observables when attachment.hashes filter is selected no field to input data can be seen. Additionally, other attachment.* filters returns "Bad Request"

Steps to Reproduce

1. Go to search/Observables
2. Select attachment.hashes filter and observe there is no input field
3. Select any other attachment.* filters and type 'test' for searching. Observe 'Bad Request' error.

Complementary information

[nadouani]

@To-om I found the following issues:

• the /api/describe doesn't return the right type for attachment.hashes field. It returns hash instead of string
• /api/v0/_search used in the Search page, produces Property attachment.size for type org.thp.scalligraph.traversal.Traversal.V[org.thp.thehive.models.Observable] not found" for attachment.* fields