defaults changes v2 (#7236)

* Update defaults (#7223)



Co-authored-by: Simon Suo <simonsdsuo@gmail.com>
Co-authored-by: Jerry Liu <jerryjliu98@gmail.com>

* changelog

* bump langchain version (#7234)

* Cache improvements (#7233)

* update typo name

* lower window size to 3

* linting

* change linux cache to /tmp

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Co-authored-by: Simon Suo <simonsdsuo@gmail.com>
Co-authored-by: Jerry Liu <jerryjliu98@gmail.com>