REST API search messages by Metadata

Hi,

The GET message by metadata is not working suddenly, it was working fine till yesterday. In lithium api browser its returning data for the same metadata query.

Lithium - API Browser – Returning Data

select * from messages where c_cust_id='test - 321'

API Call from Our application

url1 : https://test.abc.com/api/2.0/search?q=select+%2A+from+messages+where+c_cust_id%3D%27Test+-+321%27

url2 : https://test.abc.com/restapi/vc/search/messages?q=custom.id:'Test - 321'

Headers :  Content-Type - application/json

               client-id - VvhCplkjSJLJLKAkjakHLlkjALjgSLkhkjkSLKHLSasktrreyale1I=

response : {"status":"success","message":"","http_code":200,"data":{"type":"messages","list_item_type":"message","size":0,"items":[]},"metadata":{}}