I got 2 questions related to ElasticSearch.
1) First Question, I have this query with prefix
"must": [
{
"prefix": {
"user": "John"
}
}
]
with this query, I can Prefix John with User field so it results those documents in which John is found in User field. Now how can I make this query to see if John is prefixed in either any of User or email fields.
2) Second Question, I know we can apply Size and from in ElasticSearch to limit Result but I want to know that do I have to explicitly provide Size and from every time I query in ElasticSearch to continue last result or is there any other way to let the ElasticSearch do it for me that I just query and it will give results in a series left from previous.
First, note that the prefix-query does not do any text analysis, so you will not be matching e.g. john with your query.
You should look into the multi_match-query which takes the options of the match-query as well. Thus, you can combine multi_match with phrase_prefix and get the best of both: matching on multiple fields, and text analysis.
Here is a runnable example you can play with: https://www.found.no/play/gist/8197442
#!/bin/bash
export ELASTICSEARCH_ENDPOINT="http://localhost:9200"
# Index documents
curl -XPOST "$ELASTICSEARCH_ENDPOINT/_bulk?refresh=true" -d '
{"index":{"_index":"play","_type":"type"}}
{"user":"John Smith","email":"[email protected]"}
{"index":{"_index":"play","_type":"type"}}
{"user":"Alice Smith","email":"[email protected]"}
'
# Do searches
curl -XPOST "$ELASTICSEARCH_ENDPOINT/_search?pretty" -d '
{
"query": {
"multi_match": {
"fields": [
"user",
"email"
],
"query": "john",
"operator": "and",
"type": "phrase_prefix"
}
}
}
'
For your second question, look into the scroll API.
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