add more check logic when processing search request

[JerryKwan]

return error when search with start_timestamp or end_timestamp but timestamp field is not defined in index

Description

Check if timestamp field is not defined but start_timestamp or end_timestamp is set when searching

How was this PR tested?

1, Create index without timestamp field defined

doc_mapping:
  field_mappings:
    - name: title
      type: text
      tokenizer: default
      record: position
      stored: true
    - name: body
      type: text
      tokenizer: default
      record: position
      stored: true
    - name: creationDate
      type: datetime
      fast: true
      input_formats:
        - rfc3339
      precision: seconds
  timestamp_field: creationDate

search_settings:
  default_search_fields: [title, body]

indexing_settings:
  commit_timeout_secs: 10

2, Injest data

./quickwit index ingest --index stackoverflow --input-pathstackoverflow.posts.transformed-10000.json --force

3, Search without start_timestamp specified

./quickwit index search --index stackoverflow --query "search AND engine" --max-hits 1

Got result successfully

{
  "num_hits": 10,
  "hits": [
    {
      "answerId": 16049,
      "body": "Not sure if this is what you are after but you can search source code on Google. Follow the link for a search on 'function:reduce() lang:python' on Google Code search At first glance the following projects use reduce() MoinMoin Zope Numeric ScientificPython etc. etc. but then these are hardly surprising since they are huge projects. The functionality of reduce can be done using function recursion which I guess Guido thought was more explicit. Update: Since Google's Code Search was discontinued on 15-Jan-2012, besides reverting to regular Google searches, there's something called Code Snippets Collection that looks promising. A number of other resources are mentioned in answers this (closed) question Replacement for Google Code Search?. Update 2 (29-May-2017): A good source for Python examples (in open-source code) is the Nullege search engine. ",
      "creationDate": "2008-08-19T12:16:01Z",
      "questionId": 15995,
      "type": "answer",
      "user": "199"
    }
  ],
  "elapsed_time_micros": 106447,
  "errors": []
}

4, Search with start_timestamp

./quickwit index search --index stackoverflow --query "search AND engine" --max-hits 1 --start-timestamp 1218912000

Got error as expected

Command failed: API error: (code=400 Bad Request, message=the timestamp field is not set in index: ["stackoverflow"] definition but start-timestamp or end-timestamp are set in the query)

Caused by:
    (code=400 Bad Request, message=the timestamp field is not set in index: ["stackoverflow"] definition but start-timestamp or end-timestamp are set in the query)

Closes #3167

[PSeitz]

LGTM. Can you add a unit test in quickwit-search/src/tests.rs

[JerryKwan]

@PSeitz
Thanks for reviewing. I will add the test asap

[JerryKwan]

@PSeitz
Test case added, please help to review again, thank you

[PSeitz]

Nice, thanks!