Add WKT Support to Geo

[codebrain]

https://www.elastic.co/guide/en/elasticsearch/reference/current/release-notes-6.2.0.html

Two issues to consider:

• Add WKT Support to GeoBoundingBoxQueryBuilder - [GEO] Add WKT Support to GeoBoundingBoxQueryBuilder elasticsearch#27692
• Add Well Known Text (WKT) Parsing Support to ShapeBuilders - [Geo] Add Well Known Text (WKT) Parsing Support to ShapeBuilders elasticsearch#27417

[russcam]

Closing this as #3377 has been merged into 6.3, to go into 6.x