to set some custom field entry searchable i need go to channel field manager and set it manually. Have some way to set ALL fields searchable? Sql query? or anything?
It sounds very unnecessary. However if you're wanting to do it you could run a basic update query on exp_channel_fields.
UPDATE `exp_channel_fields` SET `field_search` = "y"
I have not tested this... but for basic fields it should have you covered.