[BUG] Using synonym filter after hunspell.

[aswad1]

Describe the bug

When using synonym filter after hunspell. I don't see the expected plural synonyms in the output. In the configuration below, I have added synonyms:

• stationary
• stationery
• stationaries
• stationeries

PUT /test-index3
{
  "settings": {
    "analysis": {
      "filter": {
        "custom_synonym_graph-replacement_filter": {
          "type": "synonym_graph",
          "synonyms": [
            "stationary, stationery, stationaries, stationeries"
          ]
        },
        "custom_hunspell_stemmer": {
          "type": "hunspell",
          "locale": "en_US"
        }
      },
      "analyzer": {
        "test_analyzer": {
          "type": "custom",
          "tokenizer": "whitespace",
          "filter": [
            "lowercase",
            "custom_hunspell_stemmer",
            "custom_synonym_graph-replacement_filter"
          ]
        }
      }
    }
  }

While testing, I don't see stationaries and stationeries in the output.

POST /test-index3/_analyze
{
  "analyzer": "test_analyzer",
  "text": "stationary"
}

--
{
  "tokens": [
    {
      "token": "stationery",
      "start_offset": 0,
      "end_offset": 10,
      "type": "SYNONYM",
      "position": 0
    },
    {
      "token": "stationary",
      "start_offset": 0,
      "end_offset": 10,
      "type": "SYNONYM",
      "position": 0
    },
    {
      "token": "stationary",
      "start_offset": 0,
      "end_offset": 10,
      "type": "word",
      "position": 0
    }
  ]
}

Here is the details analysis from Opensearch:

POST /test-index3/_analyze
{
  "analyzer": "test_analyzer",
  "text": "stationary",
   "explain": true
}

------------------
{
  "detail": {
    "custom_analyzer": true,
    "charfilters": [],
    "tokenizer": {
      "name": "whitespace",
      "tokens": [
        {
          "token": "stationary",
          "start_offset": 0,
          "end_offset": 10,
          "type": "word",
          "position": 0,
          "bytes": "[73 74 61 74 69 6f 6e 61 72 79]",
          "positionLength": 1,
          "termFrequency": 1
        }
      ]
    },
    "tokenfilters": [
      {
        "name": "lowercase",
        "tokens": [
          {
            "token": "stationary",
            "start_offset": 0,
            "end_offset": 10,
            "type": "word",
            "position": 0,
            "bytes": "[73 74 61 74 69 6f 6e 61 72 79]",
            "positionLength": 1,
            "termFrequency": 1
          }
        ]
      },
      {
        "name": "custom_hunspell_stemmer",
        "tokens": [
          {
            "token": "stationary",
            "start_offset": 0,
            "end_offset": 10,
            "type": "word",
            "position": 0,
            "bytes": "[73 74 61 74 69 6f 6e 61 72 79]",
            "keyword": false,
            "positionLength": 1,
            "termFrequency": 1
          }
        ]
      },
      {
        "name": "custom_synonym_graph-replacement_filter",
        "tokens": [
          {
            "token": "stationery",
            "start_offset": 0,
            "end_offset": 10,
            "type": "SYNONYM",
            "position": 0,
            "bytes": "[73 74 61 74 69 6f 6e 65 72 79]",
            "keyword": false,
            "positionLength": 1,
            "termFrequency": 1
          },
          {
            "token": "stationary",
            "start_offset": 0,
            "end_offset": 10,
            "type": "SYNONYM",
            "position": 0,
            "bytes": "[73 74 61 74 69 6f 6e 61 72 79]",
            "keyword": false,
            "positionLength": 1,
            "termFrequency": 1
          },
          {
            "token": "stationary",
            "start_offset": 0,
            "end_offset": 10,
            "type": "word",
            "position": 0,
            "bytes": "[73 74 61 74 69 6f 6e 61 72 79]",
            "keyword": false,
            "positionLength": 1,
            "termFrequency": 1
          }
        ]
      }
    ]
  }
}

The hunspell rules and dictionary files are attached.
en-US.aff.txt
en-US.dic.txt

Related component

Other

To Reproduce

N/A

Expected behavior

The screen capture for Solr analysis screenshot where the synonym graph filter is highlighted. You will see all the synonyms displayed under SGF

Additional Details

Plugins
Please list all plugins currently enabled.

Screenshots
If applicable, add screenshots to help explain your problem.

Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[prudhvigodithi]

[Triage]

Coming from #16263 and with the proposed fix to add synonym_analyzer for the synonym_graph (PR #16488) should solve this bug as well.

• Download the attached .aff and .dic files and put them under config/hunspell/en_US folder.
  Please note there is an issue in the attached .aff file, the following has to be updated to SFX Z Y 14 as SFX Z rule has 8 declared in the header but actually contains 14 rules.

SFX Z Y 8
SFX Z   0     rs         e
SFX Z   y     iers       [^aeiou]y
SFX Z   0     ers        [aeiou]y
SFX Z   0     ers        [^ey]
SFX Z   0     ners         [aiu]n
SFX Z   0     ers          [^e]an
SFX Z   e     ners         [aiu]ne
SFX Z   0     rly         e
SFX Z   y     ierly       [^aeiou]y
SFX Z   0     erly        [aeiou]y
SFX Z   0     erly        [^ey]
SFX Z   0     nerly       [aiu]n
SFX Z   0     erly        [^e]an
SFX Z   e     nerly       [aiu]ne

• Once assembled (https://github.com/prudhvigodithi/OpenSearch/tree/bug-fix-synonym) start with ./gradlew run -PnumNodes=1.

• Testing the query with synonym_analyzer.

curl -X PUT "localhost:9200/test-index5" \
-H "Content-Type: application/json" \
-d '{
    "settings": {
        "analysis": {
            "filter": {
                "custom_synonym_graph-replacement_filter": {
                    "type": "synonym_graph",
                    "synonyms": [
                        "stationary, stationery, stationaries, stationeries"
                    ],
					"synonym_analyzer": "standard"
                },
                "custom_hunspell_stemmer": {
                    "type": "hunspell",
                    "locale": "en_US"
                }
            },
            "analyzer": {
                "test_analyzer": {
                    "type": "custom",
                    "tokenizer": "whitespace",
                    "filter": [
                        "lowercase",
                        "custom_hunspell_stemmer",
                        "custom_synonym_graph-replacement_filter"
                    ]
                }
            }
        }
    }
}'

  curl -X POST "localhost:9200/test-index5/_analyze" -H "Content-Type: application/json" -d '{
	"analyzer": "test_analyzer",
	"text": "stationary"
  }'

• Output: The output now contains stationaries and stationeries.

{
  "tokens": [
    {
      "token": "stationery",
      "start_offset": 0,
      "end_offset": 10,
      "type": "SYNONYM",
      "position": 0
    },
    {
      "token": "stationaries",
      "start_offset": 0,
      "end_offset": 10,
      "type": "SYNONYM",
      "position": 0
    },
    {
      "token": "stationeries",
      "start_offset": 0,
      "end_offset": 10,
      "type": "SYNONYM",
      "position": 0
    },
    {
      "token": "stationary",
      "start_offset": 0,
      "end_offset": 10,
      "type": "word",
      "position": 0
    }
  ]
}

Thank you
@msfroh @getsaurabh02 @nupurjaiswal @dblock @aswad1