Content search API doesn't respect OR on ~ operator on title, text fields

Issue Summary

When OR operator is used on the title field with the tilde fuzzy match operator, results are not returned from both clauses. If one clause is exact match =, then the results will be from the title= search. If both clauses are ~, results will be returned from the first clause. 

When I run https://ecosystem.atlassian.net/wiki/rest/api/search?cql=title%20~%20test I get a totalSize of 142
When I run https://ecosystem.atlassian.net/wiki/rest/api/search?cql=title%20=%20new I get a totalSize of 39
When I run booth in the same query https://ecosystem.atlassian.net/wiki/rest/api/search?cql=title%20~%20test%20or%20title%20=%20new I get a totalSize 25 Shouldn’t be more than 142? Looks like it have something to do with the use of ~
If I use = instead it seems to work.
When I run https://ecosystem.atlassian.net/wiki/rest/api/search?cql=title%20=%20test I get a totalSize of 133
When I run https://ecosystem.atlassian.net/wiki/rest/api/search?cql=title%20=%20new I get a totalSize of 38
When I run booth in the same query https://ecosystem.atlassian.net/wiki/rest/api/search?cql=title%20=%20test%20or%20title%20=%20new I get a totalSize 170 which feels like the right number (One page with both test and new in the title 133 + 38 = 171)

Steps to Reproduce

1. run a CQL query that uses title=something OR title~something else. 
2. the results will only match title=something

Expected Results

The results match title=something or title~something else 

Actual Results

The results match only title=something

Workaround

The only known work around is running the two clauses of the CQL query independently and aggregating the results.