[ENGINE] Fix updates dynamic settings in InternalEngineHolder

After the refactoring in #8784 some settings didn't get passed to the
actual engine and there exists a race if the settings are updated while
the engine is started such that the actual starting engine doesn't see
the latest settings. This commit fixes the concurrency issue as well as
adds tests to ensure the settings are reflected.
[GEO] Fix for NPE enclosed in SearchParseException for a "geo_shape" filter or query

This fix adds better error handling for parsing multipoint, linestring, and polygon GeoJSONs.  Current logic throws a NPE when parsing a multipoint, linestring, or polygon that does not comply with the GeoJSON specification. That is, if a user provides a single coordinate instead of an array of coordinates, or array of linestrings, the ShapeParser throws a NPE wrapped in a SearchParseException instead of a more useful error message.

Closes #8432