Querying couchbase array column

Im trying to query the array column in couchbase using UNNESt. But getting the below error.

Query:

SELECT * FROM alerts UNNEST timestamps WHERE timestamps'2018-04-21T06:37:44.512Z' BETWEEN '2018-04-21T08:37:44.512Z'

Error messgae:

[  {"code": 3000,"msg": "syntax error - at '2018-04-21T06:37:44.512Z'","query_from_user": "SELECT * FROM `alerts` UNNEST timestamps WHERE timestamps '2018-04-21T06:37:44.512Z'  BETWEEN '2018-04-21T08:37:44.512Z'"  }]

Table content:SELECT * FROM 'alerts';

[  {"alerts": {"alertid": "3c217a81450278b38f3ad1a7260955d4","severity": 3,"tally": 540,"timestamps": ["2018-04-21T07:37:44.512Z"      ],"type": "ALERTS"    }  }]