Improve BulkSession error handling

• callback now supports request failures as well
• more flexible handling of exceptions in the BulkSession. Defaults to throwing and closing the session.

Simpler search responses

• default keepAlive of 1 minute on searchAfter
• simplify IndexRepository search response now that we have parseHits
• add parseHit extension function to SearchResponse.Hit
• add delete point in time API

Opensearch 2.x support and misc API improvements

• add opensearch 2 as a supported version, mark search_after as supported by opensearch 2.x
• new usable extension property on ClusterStatus that is true if yellow or green.
• add an example kts script and document how to use kt-search with kts scripts
• add parseHit on SearchResponse
• add ids extension function to quickly get the ids out of the search response
• make the SearchDSL block optional so you can search for everything
• add a variant of indexDocument that serializes an object
• much improved documentation

Seriailization support in BulkSession, documentation

• documentation is no longer a work in progress, added lots of it
• add extension functions to BulkSession that serialize an object
• support kproperty for key names in JsonDsl

Improve sort dsl & tweak index mappings dsl

A few minor tweaks:

• sort dsl add functions now have default values for most parameters
• support missing on sort fields
• the block parameter for IndexRepository.createMapping now comes last so you can move it outside of the parentheses

Fix dependencies to be marked api

• Search client dependencies are now pulled in transitively.
• Add coerceInputValues to default json configuration for kotlinx.serialization to ensure new enum values don't break deserialization

First preview of upcoming 2.0

Lots of changes since 1.x

• Multi platform, kotlinx serialization and kto based
• Compatible with Opensearch, Elasticsearch 7 & 8
• No more Java Rest High Level client dependence or code generation for that.
• Improved DSL support