Why is the response of the _analyze API not consistent?

Elastic Stack Elasticsearch
1

Hi!
We are using Elasticsearch 7.10.2 and we noticed that the response received when the {indexName}/_analyze API is called repetitively with the same request, is sometimes different.
For instance, given the following request:

{
  "filter": [],
  "char_filter": [
    "some_custom_char_filter"
  ],
  "text": "some text",
  "explain": true,
  "attributes": []
}

the response sometimes contains tokenFilters: [] and sometimes tokenFilters: null.

Can you help me understand why and how can I have a consistent response?
Thanks in advance

2

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