elasticsearch-js: DeserializationError: Unexpected end of JSON input

🐛 Bug Report

We are making Elasticsearch queries in a test file. The test file has multiple tests, each performing a query. We tried reordering the tests in the file and found that the first test in the file will be the only one that fails. Even with a stripped down body for the query, we are still inconsistently getting the following error:

Text: “DeserializationError: Unexpected end of JSON input”

To Reproduce

Run the following test multiple times (it takes a variable number of attempts to get the failure):

import { Client } from '@elastic/elasticsearch

const defaultClient = new Client({
    node: host,
    sniffOnStart: true
})

describe('elastic test', () => {
    test('it should not have deserialization errors', async () => {
        await defaultClient.search({
            index: 'common',
            type: '_doc',
            body: {
                query: {
                    match_all: {}
                }
            }
        })
    })
})

Expected behavior

The test should be passing consistently.

Your Environment

• node version: 10.11.0
• @elastic/elasticsearch version: ^7.5.1
• os: Mac
• Elasticsearch instance version: 7.4.2

Please let me know if you need any additional information!