The change made in AbstractPointGeometryFieldMapper class
with commit 050389736599e40c49278e900d5060f75b959282 introduced
a performace degradation during point data indexing. Reverting it therefore.

The change is about consolidating array format parsing code for point type in a single place to acheive following benefits.
1. Allow plugins to override array parsing logic. Plugins can add its own parsing logic for point field by providing object parser. However, it cannot override array format. Therefore, plugin have to use whatever implemented in AbstractPointGeometryFieldMapper class.
2. Enhanced code quality by removing duplicated code

There is no change in functionality because 1. There is no change in functionality in OpenSearch and 2. No plugins have its own parsing logic for point data in array format yet.

Signed-off-by: Heemin Kim <heemin@amazon.com>

Signed-off-by: Heemin Kim <heemin@amazon.com>