[DOCS] should use setPostFilter instead of setFilter
fixed markup and typo
[DOCS] add DynamoDB river plugin
add elasticsearch-osem to integrations page
[DOCS] fixed count and validate query docs, they now require a top-level query object, same as other apis

Relates to #4074
Closes #5111
[DOCS] rephrased delete by query docs
[DOCS] fixed count docs, it now requires a top-level query object, same as other apis

Relates to #4074