Response of GET /api/v1/messages/{message_id}/metadata.
 Returns the metadata of a message.

### messageId(): String

The message id of this message

### parentMessageIds(): String[]

The ids of the parents of this message

### isSolid(): boolean

IF this message is solid

### referencedByMilestoneIndex(): long

The optional milestone index if this message is referenced

### milestoneIndex(): long

The optional milestone index this was included in

### ledgerInclusionState(): Optional&lt;[LedgerInclusionStateDto](#ledgerinclusionstatedto)&gt;

The ledger state

### conflictReason(): int

The optional reason of conflict

### shouldPromote(): Optional&lt;Boolean&gt;

Optional; if the message needs to be promoted

### shouldReattach(): Optional&lt;Boolean&gt;

Optional; if the message needs to be reattached