What is the config location of elastic search? Where should the synonyms file be placed?
You can place synonyms file in path relative to the config location.
You can have a look at Directory layout of your ES setup.It contains a config folder where you can place your synonym file and then specify relative path of that file.
For Example
"filter" : { "synonym" : { "type" : "synonym", "synonyms_path" : "analysis/synonym.txt" } }The above configures a synonym filter, with a path of analysis/synonym.txt (relative to the config location).
See this for more detail
EDIT:
You can also specify absolute path. As per doc
The path to the synonyms file should be specified with the synonyms_path parameter, and should be either absolute or relative to the Elasticsearch config directory.
Refer this