Patch unstructured bool

[wanliAlex]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  we patch the unstructured bool behavior so users can filter on the string bool field {"string_bool": "true"}

• What is the current behavior? (You can also link to an open issue here)
  we can't filter the string_bool field(str)
  bool field is not returned in the search results

• What is the new behavior (if this is a feature change)?
  users can filter on the string bool field {"string_bool": "true"}
  bool field will be returned in the search results

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  no

• Have unit tests been run against this PR? (Has there also been any additional testing?)
  no

• Related Python client changes (link commit/PR here)
  no

• Related documentation changes (link commit/PR here)
  no

• Other information:
  no

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes/features)
• Docs have been added / updated (for bug fixes / features)

[farshidz]

As discussed please check structured tests and consider doing a full comparison of schemas rather than individual asserts