When creating an analyzer, difference between stopwords and filter:"stop"?

Elastic Search
1

Hello,

I want to create my own analyzer and I don't understand the difference between "filter": "stop" and the options "stopwords" which seem to be overlapping to me. Are they doing the same thing?

Examples from doc:

What is the difference between both?

Thank you,
Yoann

2

Hi @Yoann_Buzenet ,

In Elasticsearch, "filter": "stop" and "stopwords" are used to remove common, unimportant words like "the", "and", "a" during text analysis. "filter": "stop" is like a special tool you create to filter out these words, and you can use it in multiple places. On the other hand, "stopwords" is a direct list of words you tell Elasticsearch to ignore. Think of "filter": "stop" as a reusable coffee filter you can use with many cups, while "stopwords" is a specific list of words for one particular cup.

Simple Example:

PUT /my_index
{
  "settings": {
    "analysis": {
      "analyzer": {
        "my_analyzer": {
          "type": "custom",
          "tokenizer": "standard",
          "filter": [
            "lowercase",
            "my_stop_filter"
          ]
        }
      },
      "filter": {
        "my_stop_filter": {
          "type": "stop",
          "stopwords": ["the", "and", "a"]
        }
      }
    }
  }
}

In this example, we create an analyzer called my_analyzer that uses a filter named my_stop_filter to remove the words "the", "and", and "a" from the text during indexing.