Add validation to check max int limit in train API

[jmazanec15]

Signed-off-by: John Mazanec jmazane@amazon.com

Description

This PR checks to see if the int parameters in the training API are within integer bounds. If not, it will throw an illegal argument exception which will get propagated back to the user as a 400 error.

For validation, we use the NumberFieldMappers INTEGER type's parser. Code can be found here.

Validation:

curl -X POST "localhost:9200/_plugins/_knn/models/_train" -H 'Content-Type: application/json' -d'
{
  "training_index": "train_index",
  "training_field": "train_field",
  "dimension": 8,
  "description": "this should be allowed to be null",
  "max_training_vector_count": 1312321312313123112312123123,
  "method": {
      "name":"ivf",
      "engine":"faiss",
      "space_type": "l2",
      "parameters":{
        "nlist":16,
        "encoder":{
            "name":"pq",
            "parameters":{
                "code_size":8,
                "code_count": 2
            }
        }
      }
  }
}
'
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Value [1312321312313123112312123123] is out of range for an integer"}],"type":"illegal_argument_exception","reason":"Value [1312321312313123112312123123] is out of range for an integer"},"status":400}

Check List

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[vamshin]

LGTM! Thanks

[codecov-commenter]

Codecov Report

Merging #159 (5ccc22b) into main (c14f977) will not change coverage.
The diff coverage is 33.33%.

@@            Coverage Diff            @@
##               main     #159   +/-   ##
=========================================
  Coverage     82.82%   82.82%           
  Complexity      801      801           
=========================================
  Files           117      117           
  Lines          3580     3580           
  Branches        339      339           
=========================================
  Hits           2965     2965           
  Misses          461      461           
  Partials        154      154           

Impacted Files	Coverage Δ
...nsearch/knn/plugin/rest/RestTrainModelHandler.java	61.90% <33.33%> (ø)

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