the-rest-of-batch.java

List<String> bigList = Arrays.asList("1","2"....."6000")

for (int i = 0; i < bigList.size(); i++) {

    String tokenToSearch = bigList.get(i);

    if (i % 100 == 0) {
        if (i != 0) {
            bufferedWriter.close();
        }
        outputStream = new FileOutputStream("result" + i + ".txt");
        outputStreamWriter = new OutputStreamWriter(outputStream, "UTF-8");
        bufferedWriter = new BufferedWriter(outputStreamWriter);
    }

    // rest calls....

    bufferedWriter.write(tokenToSearch + "," + resultYouNeeed);
    bufferedWriter.newLine();
    
}

Related to medium article:

https://medium.com/nerd-for-tech/how-we-recovered-more-than-6k-users-data-using-kibana-api-5770101ec0ae