What would happen if we send lot more requests than the elasticsearch cluster can handle concurrently

Elastic Stack Elasticsearch
1

What would happen if we send lot more requests than the elasticsearch cluster can handle concurrently like in batch procesing from a hadoop cluster . That is if we blast the elastic search cluster with high volume of requests. To what extent can it queue them and handle ? What would happen would it crash or would it be just slow ?

Thanks
Subra

2

What types of requests are you talking about - e.g. search or indexing? If search, what types of queries?

Here are a few pointers to get started reading:

If you are planning to integrate Hadoop and ES, did you have a look at https://www.elastic.co/products/hadoop