ElasticsearchClient should filter index names for invalid characters

[aateeque]

I have come across Elasticsearch issues when using ElasticsearchClient to publish to an index. The method I am using is:
Elasticsearch.Net.IElasticsearchClient.Index(string index, string type, object body, Func<IndexRequestParameters, IndexRequestParameters> requestParameters = null);

The exception on Elasticsearch server is:
org.elasticsearch.indices.InvalidIndexNameException: [a name with a space] Invalid index name [a name with a space], must not contain the following characters [\, /, *, ?, ", <, >, |, , ,] at org.elasticsearch.cluster.metadata.MetaDataCreateIndexService.validateIndexName(MetaDataCreateIndexService.java:173

In this case I would ElasticsearchClient to throw an exception because of the unescaped invalid characters before it causes problems on the server.

[gmarz]

Hi @aateeque this has been brought up before, and we decided against doing any client side validation like this. See #1017 for details.

[aateeque]

Thanks @gmarz