Provide a way to run a custom Elasticsearch query as the default search

[MikeAlhayek]

Is your feature request related to a problem? Please describe.

In the search module, the only available option to conduct a search is using query-string or multi-match query by providing a list of default fields to search. What if I want to customize the query for example by using fuzziness or other options? Currently, there is no simply way to configure the default search to use advance search options.

Describe the solution you'd like

I think we should add a way for the user to define the a custom query that we would use to perform the search. For example, I want to define this query to be used when the a user search the default index.

{
  "query": {
    "match": {
      "Content.ContentItem.FullText": {
        "query": "{{ term }}",
        "fuzziness": "AUTO",
        "analyzer": "whitespace"
      }
    }
  }
}

[sebastienros]

Use JSON encoding in the template renderer such that by default all inputs are encoded.
Devs can still user {{ terms | raw }} is they want to bypass it.