Update update.asciidoc

Closes #6577
test random strings in CompressedStringTests
Internal: Remove (mostly) unused 'failure' member from ShardSearchFailure.

closes #6837
closes #6861
test some random bytes with compressed streams
test some linedocs data with compressed streams
[TEST] Associate type with percolate query
add more evilness to compressed streams test
ensure we exceed 65k in size sometimes in test
move unused code to src/test