indexing - Elasticsearch: add a synonym filter on my english analyser -

i've got index field description analysed that:

"description":{       "analyzer" : "english",       "type" : "string" } 

i have defined synonyms dictionnary in file synonyms.txt contain:

ipod, i-pod, pod => i-pod 

i add synonym dictionnary analyzer, don't know how it. should define custom analyzer? if diverge current indexation due customisation.index

yes, should define custom analyzer. can start standard english analyzer, , add synonymfilter that:

{   "settings": {     "analysis": {       "filter": {         "english_stop": {           "type":       "stop",           "stopwords":  "_english_"          },         "english_keywords": {           "type":       "keyword_marker",           "keywords":   []          },         "english_stemmer": {           "type":       "stemmer",           "language":   "english"         },         "english_possessive_stemmer": {           "type":       "stemmer",           "language":   "possessive_english"         },         "my_synonyms" : {           "type" : "synonym",           "synonyms_path" : "path/to/synonym.txt"         }       },       "analyzer": {         "custom_english": {           "tokenizer":  "standard",           "filter": [             "english_possessive_stemmer",             "lowercase",             "my_synonyms",             "english_stop",             "english_keywords",             "english_stemmer"           ]         }       }     }   } } 

as far whether diverge, yes. if applying synonyms index time, newly indexed data have synonym filter applied, existing data not. if want changes index-time analysis apply consistently, need re-index data.

if change analysis only in search_analyzer, there no need re-index.