OAK-9696 Improve query syntax support for dynamicBoost in ElasticSearch (#494)
* OAK-9696 Improve query syntax support for dynamicBoost in ElasticSearch
* OAK-9696 Improve query syntax support for dynamicBoost in ElasticSearch: improvement for code review
* OAK-9696 Improve query syntax support for dynamicBoost in ElasticSearch: change the index field to fixed one
* OAK-9696 Improve query syntax support for dynamicBoost in ElasticSearch: fixed the document storing proper outside the loop
* OAK-9696 Improve query syntax support for dynamicBoost in ElasticSearch: add tests to cover multiple boost fields query
* OAK-9696 Improve query syntax support for dynamicBoost in ElasticSearch: use fulltext field to store dynamic boost tags