Highlighting is not working as expected with synonym wordnet filter in elasticsearch

(Ashwin Rao) #1

Hi Guys,
I am facing some issue in highlighting synonyms which are mapped from Wordnet. It is highlighting irrelevant words while searching.

Here's my code below.

"settings" : {
"index" : {
"analysis" : {
"analyzer" : {
"synonym" : {
"tokenizer" : "standard",
"filter" : ["synonym","lowercase"]
"filter" : {
"synonym" : {
"type": "synonym",
"format" : "wordnet",
"synonyms_path": "analysis/wn_s.pl"
"mappings": {
"header": {
"properties": {
"test_string": {
"type": "text",
"analyzer": "synonym",
"term_vector": "with_positions_offsets"

My search query .
{"query": { "query_string": { "query": "info~" }},"highlight": {"pre_tags": [""],"post_tags": [""],"fields" : {"test_string":{}},"fragment_size" :501, "number_of_fragments" : 1}}

Results are as below.

TEST: This area contains the Customer name: TEST Customer Type TEST: This area contains information on the type: TEST DLA

Note : Please click ' new value' column and 'old value' column on the Contract Header page to view complete values.

Note: Transaction report present on Header display only partial value, user need to click ' Old Value' and 'New Value' to view complete.

In the above results , i wanted only "information" to be highlighted , but its highlighting "new" and "old" text. I also analysed the token output and find that it is working as expected but highlight is causing problem.

Elasticsearch version - 6.2.4

Please suggest where I am going wrong. Thanks.

(Christoph) #2

Can you add the synonym file or tell me where you got it from? I'd help recreate the issue.

(system) #3

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