search: improve with CompositeSuggestQueryParser

[ptamarit]

❤️ Thank you for your contribution!

Description

• Fixes Improve users search results #150 (see details in description)
• Commits
  1. The first commits makes the test assertions more precise
  2. The second commit uses CompositeSuggestQueryParser to improve search results

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[ptamarit]

fuzziness is applied in CompositeSuggestQueryParser.

[ptamarit]

⚠️
Searching for a username with a dash is still not working well.
For instance, searching from "one-two" seems to search for usernames starting with "one" and starting with "two", and therefore does not find anything.

[kpsherva]

I think this is the issue: text field is split by - https://github.com/inveniosoftware/invenio-users-resources/blob/master/invenio_users_resources/records/mappings/os-v2/users/user-v3.0.0.json#L132
if you search by username.keyword, it should work

[ptamarit]

Awesome, thanks a lot @kpsherva !
2 months later 😅, I confirm that this fixes the issue.

I modified the tests to include a username with a dash, and I added a test showing that usernames with dashes can now be searched properly.

[zzacharo]

This seems like a long standing PR. Can we maybe have a summary of the improvements or maybe a small demo?

[ptamarit]

This seems like a long standing PR. Can we maybe have a summary of the improvements or maybe a small demo?

@zzacharo Sorry for the long wait. I finally found time to get back to it, and it's now ready for prime time.

What is described in the linked issue is a good summary of the problems:

Searching for a person with a common given name and a common family name includes every user with either one of the names and the ranking does not help.
Searching for users with a dash in their usernames behaves the same way.

Happy to give a demo, but the tests are meant to show what changed in this pull request:

1. The test modification in the 2nd commit shows that: before, searching for 2 words was including all the users matching at least 1 of the 2 words. Now, searching for 2 words only includes users matching both words. This means that if a user has a common name, adding more words should help restrict the results and find the proper result.
   
2. The test modification in the 4th commit shows that: before, searching for pub-res would not return the user with the username pub-res. Now, it works as expected.