SQL: Introduce an async querying mode for SQL (backport of #73991) #74643
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This adds an async query mode to SQL. It (re)uses the same request and response async-specific EQL object parameters. Also similar to EQL, the running search task can have its state monitored and canceled and its results stored and deleted, with intermediary responses not supported (the entire result is available once search finished). The async implementation is extended to work with the SQL-specific text formats (txt, csv, tsv) as well, besides xcontent. Closes elastic#71041. (cherry picked from commit 42cc419)
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This adds an async query mode to SQL.
It (re)uses the same request and response async-specific EQL object
parameters.
Also similar to EQL, the running search task can have its state
monitored and canceled and its results stored and deleted, with
intermediary responses not supported (the entire result is available
once search finished).
The async implementation is extended to work with the SQL-specific
text formats (txt, csv, tsv) as well, besides xcontent.
Closes #71041.
(cherry picked from commit 42cc419)