prepare release 0.41.2
documentation: rest: improve readability - emph keywords.
Merge pull request #1049 from crate/l/docs-improve-readability

documentation: rest: improve readability - emph keywords.
add bulkArgs to SQLRequest
Added benchmark test to compare bulk inserts with multiple insert statements
check bulk_args for mixed types
use BulkShardProcessor instead of TransportBulkAction
support inserts using bulk arguments
create XContent instead of Maps in InsertAnalyzer
set autoCreateIndices value correctly in ESBulkIndexTask
avoid bytesRef/String conversion in InsertFromValuesAnalyzer

XContentBuilder can handle utf8 bytes if wrapped inside a
class that implements the Text interface.