When it comes to transferring ownership of records (https://help.salesforce.com/articleView?id=data_about_transfer.htm&language=en_us&type=5), you will want to ensure that you properly get child objects and be aware of some of the side effects of transferring, such as:


When transferring accounts and their related data in Professional, Enterprise, Unlimited, Performance, and Developer Editions, all previous access granted by manual sharing, Apex managed to share, or sharing rules is removed. New sharing rules are then applied to the data based on the new owner. The new owner may need to manually share the transferred accounts and opportunities as necessary to grant access to certain users.


Spend some time reading up on some of that so you don't have any issues. Once you are ready to do the transfer, you will be much better served using the built-in Salesforce tool for mass transferring records (https://help.salesforce.com/articleView?id=admin_transfer.htm&language=en_us&type=5) then attempting to do this through direct data manipulation with SOQL and DML. Some objects will have additional options when changing ownership (https://help.salesforce.com/HTViewHelpDoc?id=account_owner.htm&language=en_US) that SOQL/DML will not take into account as well.


This post on StackExchange recommends putting the ID filter within the returned data - you might want to try this approach out:

FIND {term} IN ALL FIELDS RETURNING Account(Id, Name, Owner.Name WHERE Owner.Name LIKE 'Mark%')

http://salesforce.stackexchange.com/questions/92435/sosl-on-lookup-fields-not-working


For reference check this too,

https://developer.salesforce.com/forums/?id=906F000000095PbIAI


Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.

Thanks.