Instance - support keyword search subjects field

Purpose/Overview:
The purpose of this story is to allow the user a keyword search within series field only.

Requirements/Scope:
1. Case insensitive
2. Word match in the following Inventory Instance field: subject (array of strings)
3. Supports search in other than English languages (including CKJ languages, Arabic, Hebrew)

Acceptance criteria:

• Query returns accurate hit count
• User can search by any word that is a part of the field's value
• Results are ranked based on term frequency, inverse document frequency and field length
• Stemming according with configured on the tenant language tokenizers

Assumptions:

• Hyphens are treated as separators of the tokens.

Outside the scope

• UI work
• AND, OR, NOT and NESTING

Additional Information:
Inventory Instance schema: https://github.com/folio-org/mod-inventory-storage/blob/master/ramls/instance.json
Honeysuckle bugfest environment: https://bugfest-honeysuckle.folio.ebsco.com/