Parameter Support by Search Index
Each search index supports only a subset of all
ItemSearch parameters. For example, in the US locale, when
you specify the Blended search index, you can only use one parameter: Keywords, in a request. Using any of the other
parameters in that request would return an error.
All other search indices support multiple parameters. For example, when you specify the Beauty search index, in the US locale, you can include one or more of the following parameters in the request.
The search index—parameter combinations, for the most part, make sense. For
example, if you use the Automotive search index, the
parameter is invalid in the request. This restriction makes intuitive sense. So, in
general, it is not the case that you need to memorize all of the parameters that can
be used in each search index.