Fulltext working on MySQL 5.6, not 5.7 - mysql

Question

I have 2 main tables (professional_account & professional_profile) and 3 sub tables (prof_knows_about, prof_keywords & prof_recent_jobs) which are 1:many off professional_profile.
A FT search should match the search term in professional_profile.professional_statement, OR any row (for that professional_id) of prof_knows_about.knowledge_desc, OR any row of prof_keywords.keyword OR any row of prof_recent_jobs.job_title
In a 5.6.35 server it works as expected, but in 5.7.10 I only get results if the search term is in professional_profile.professional_statement or prof_knows_about.knowledge_desc - the search term is not found in the other two tables. Both servers run on freeBSD UNIX.
I tried both servers with the query pasted into the shell. Both also give same EXPLAIN output. Used a dump from the 5.7 on the 5.6 to ensure same data and table creates.
I did a show variables on both servers, but hard to compare as there are many extra values in the 5.7. Set both to same sql_mode.
Tables, query and explain listed below.
Is this an issue with my query, or my 5.7 server?
select email, PROFILE.*
FROM professional_account as ACC
join professional_profile as PROFILE on ACC.professional_id=PROFILE.professional_id
join prof_knows_about as KNOWS on PROFILE.professional_id=KNOWS.professional_id
join prof_keywords as KEYW on PROFILE.professional_id = KEYW.professional_id
join prof_recent_jobs as ROLES on PROFILE.professional_id=ROLES.professional_id
where status in ('LIVE','EDITS')
and (
match (knowledge_desc) against ('ramble')
or match (job_title) against ('ramble')
or match (keyword) against ('ramble')
or match (professional_statement) against ('ramble')
)
group by PROFILE.professional_profile_id
+----+-------------+---------+------------+--------+--------------------------------+-----------------+---------+---------------------------+------+----------+---------------------------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+---------+------------+--------+--------------------------------+-----------------+---------+---------------------------+------+----------+---------------------------------+
| 1 | SIMPLE | KNOWS | NULL | ALL | professional_id | NULL | NULL | NULL | 43 | 100.00 | Using temporary; Using filesort |
| 1 | SIMPLE | PROFILE | NULL | ref | PRIMARY,professional_statement | professional_id | 4 | xxx.KNOWS.professional_id | 1 | 28.57 | Using where |
| 1 | SIMPLE | ACC | NULL | eq_ref | PRIMARY | PRIMARY | 4 | xxx.KNOWS.professional_id | 1 | 100.00 | NULL |
| 1 | SIMPLE | ROLES | NULL | ref | professional_id | professional_id | 4 | xxx.KNOWS.professional_id | 1 | 100.00 | NULL |
| 1 | SIMPLE | KEYW | NULL | ref | professional_id | professional_id | 4 | xxx.KNOWS.professional_id | 2 | 100.00 | Using where |
+----+-------------+---------+------------+--------+--------------------------------+-----------------+---------+---------------------------+------+----------+---------------------------------+
CREATE TABLE professional_account (
professional_id int(11) NOT NULL AUTO_INCREMENT,
email varchar(60) NOT NULL,
PRIMARY KEY (professional_id),
KEY email (email)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE professional_profile (
professional_profile_id int(11) NOT NULL AUTO_INCREMENT,
professional_id int(11) NOT NULL,
status enum('BLANK','PART_WAIT','PART_APP','COMP_WAIT','COMP_APP','LIVE','EDITS') DEFAULT NULL,
professional_statement text,
PRIMARY KEY (professional_profile_id),
KEY professional_id (professional_id),
FULLTEXT KEY professional_statement (professional_statement),
CONSTRAINT fk_professional_profile_professional_account FOREIGN KEY (professional_id) REFERENCES professional_account (professional_id) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE prof_knows_about (
prof_knows_about_id int(11) NOT NULL AUTO_INCREMENT,
professional_id int(11) NOT NULL,
knowledge_desc varchar(100) DEFAULT NULL,
PRIMARY KEY (prof_knows_about_id),
KEY professional_id (professional_id),
FULLTEXT KEY knowledge_desc (knowledge_desc),
CONSTRAINT fk_prof_knows_about_professional_profile1 FOREIGN KEY (professional_id) REFERENCES professional_profile (professional_id) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE prof_keywords (
prof_keywords_id int(11) NOT NULL AUTO_INCREMENT,
professional_id int(11) NOT NULL,
keyword varchar(20) DEFAULT NULL,
PRIMARY KEY (prof_keywords_id),
KEY professional_id (professional_id),
FULLTEXT KEY keyword (keyword),
CONSTRAINT fk_prof_keywords_professional_profile1 FOREIGN KEY (professional_id) REFERENCES professional_profile (professional_id) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE prof_recent_jobs (
prof_recent_jobs_id int(11) NOT NULL AUTO_INCREMENT,
professional_id int(11) NOT NULL,
job_title varchar(100) DEFAULT NULL,
experience tinyint(2) DEFAULT NULL,
PRIMARY KEY (prof_recent_jobs_id),
KEY professional_id (professional_id),
FULLTEXT KEY job_title (job_title),
CONSTRAINT fk_prof_recent_jobs_professional_profile1 FOREIGN KEY (professional_id) REFERENCES professional_profile (professional_id) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE prof_keywords (
prof_keywords_id int(11) NOT NULL AUTO_INCREMENT,
professional_id int(11) NOT NULL,
keyword varchar(20) DEFAULT NULL,
PRIMARY KEY (prof_keywords_id),
KEY professional_id (professional_id),
FULLTEXT KEY keyword (keyword),
CONSTRAINT fk_prof_keywords_professional_profile1 FOREIGN KEY (professional_id) REFERENCES professional_profile (professional_id) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;