Proposing a PR to fix a few small typos

[timgates42]

Issue Type

[x] Bug (Typo)

Steps to Replicate and Expected Behaviour

• Examine docs/guide/reference/index-modules/merge.rst and observe throtted, however expect to see throttled.
• Examine pyes/es.py and observe succesful, however expect to see successful.
• Examine docs/guide/reference/query-dsl/text-query.rst and observe subsitute, however expect to see substitute.
• Examine pyes/es.py and observe prefered, however expect to see preferred.
• Examine docs/guide/reference/api/search/search-type.rst and observe maintaing, however expect to see maintaining.
• Examine pyes/query.py and observe functoin, however expect to see function.
• Examine docs/guide/reference/index-modules/store.rst and observe fieds, however expect to see fields.
• Examine README.rst and observe elastisearch, however expect to see elasticsearch.

Notes

Semi-automated issue generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

To avoid wasting CI processing resources a branch with the fix has been
prepared but a pull request has not yet been created. A pull request fixing
the issue can be prepared from the link below, feel free to create it or
request @timgates42 create the PR.

https://github.com/timgates42/pyes/pull/new/bugfix_typos

Thanks.