Elasticsearch 8.5 Custom Analyzer Not Breaking Text as Expected with Special Characters
I'm currently working on an Elasticsearch 8.5 setup where I've defined a custom analyzer intended to handle text with special characters. However, the analyzer doesn't seem to break down the text as expected, specifically when special characters like `@`, `#`, and `&` are involved. I've defined the analyzer in my index settings like this: ```json { "settings": { "analysis": { "analyzer": { "custom_analyzer": { "type": "custom", "tokenizer": "standard", "filter": ["lowercase", "custom_char_filter"] } }, "char_filter": { "custom_char_filter": { "type": "pattern_replace", "pattern": "[\@\#\&]", "replacement": " " } } } } } ``` Despite this configuration, when I index a document containing the text "Hello @World#2023 & Developers", the analyzer does not split the tokens as I anticipated. It seems to ignore the custom character filter completely. I've tried reindexing the data after changing the analyzer settings, but the behavior remains unchanged. Here's how I'm verifying the analyzer’s output: ```json GET /my_index/_analyze { "analyzer": "custom_analyzer", "text": "Hello @World#2023 & Developers" } ``` The response I get back is `"tokens": [{"token": "hello", "start_offset": 0, "end_offset": 5, "type": "<ALPHANUM>", "position": 0}, {"token": "world2023", "start_offset": 6, "end_offset": 17, "type": "<ALPHANUM>", "position": 1}, {"token": "developers", "start_offset": 18, "end_offset": 28, "type": "<ALPHANUM>", "position": 2}]`, which shows that the special characters are not being replaced by a space as I intended. I have also looked at the Elasticsearch documentation for custom analyzers and tokenizers, but I’m still stuck. Is there something I’m missing in the analyzer configuration? Any insights on how to resolve this would be greatly appreciated! I'm coming from a different tech stack and learning Json. Any help would be greatly appreciated!