percolate: Percolater

In ropensci/elastic: General Purpose Interface to 'Elasticsearch'

Percolater

Description

Store queries into an index then, via the percolate API, define documents to retrieve these queries.

Usage

percolate_register(
  conn,
  index,
  id,
  type = NULL,
  body = list(),
  routing = NULL,
  preference = NULL,
  ignore_unavailable = NULL,
  percolate_format = NULL,
  refresh = NULL,
  ...
)

percolate_match(
  conn,
  index,
  type = NULL,
  body,
  routing = NULL,
  preference = NULL,
  ignore_unavailable = NULL,
  percolate_format = NULL,
  ...
)

percolate_list(conn, index, ...)

percolate_count(conn, index, type, body, ...)

percolate_delete(conn, index, id, ...)

Arguments

conn	an Elasticsearch connection object, see connect()
index	Index name. Required
id	A precolator id. Required
type	Document type. Required
body	Body json, or R list.
routing	(character) In case the percolate queries are partitioned by a custom routing value, that routing option makes sure that the percolate request only gets executed on the shard where the routing value is partitioned to. This means that the percolate request only gets executed on one shard instead of all shards. Multiple values can be specified as a comma separated string, in that case the request can be be executed on more than one shard.
preference	(character) Controls which shard replicas are preferred to execute the request on. Works the same as in the search API.
ignore_unavailable	(logical) Controls if missing concrete indices should silently be ignored. Same as is in the search API.
percolate_format	(character) If ids is specified then the matches array in the percolate response will contain a string array of the matching ids instead of an array of objects. This can be useful to reduce the amount of data being send back to the client. Obviously if there are two percolator queries with same id from different indices there is no way to find out which percolator query belongs to what index. Any other value to percolate_format will be ignored.
refresh	If TRUE then refresh the affected shards to make this operation visible to search, if "wait_for" then wait for a refresh to make this operation visible to search, if FALSE (default) then do nothing with refreshes. Valid choices: TRUE, FALSE, "wait_for"
...	Curl options. Or in percolate_list function, further args passed on to Search()

Details

Additional body options, pass those in the body. These aren't query string parameters:

• filter - Reduces the number queries to execute during percolating. Only the percolator queries that match with the filter will be included in the percolate execution. The filter option works in near realtime, so a refresh needs to have occurred for the filter to included the latest percolate queries.

• query - Same as the filter option, but also the score is computed. The computed scores can then be used by the track_scores and sort option.

• size - Defines to maximum number of matches (percolate queries) to be returned. Defaults to unlimited.

• track_scores - Whether the _score is included for each match. The _score is based on the query and represents how the query matched the percolate query's metadata, not how the document (that is being percolated) matched the query. The query option is required for this option. Defaults to false.

• sort - Define a sort specification like in the search API. Currently only sorting _score reverse (default relevancy) is supported. Other sort fields will throw an exception. The size and query option are required for this setting. Like track_score the score is based on the query and represents how the query matched to the percolate query's metadata and not how the document being percolated matched to the query.

• aggs - Allows aggregation definitions to be included. The aggregations are based on the matching percolator queries, look at the aggregation documentation on how to define aggregations.

• highlight - Allows highlight definitions to be included. The document being percolated is being highlight for each matching query. This allows you to see how each match is highlighting the document being percolated. See highlight documentation on how to define highlights. The size option is required for highlighting, the performance of highlighting in the percolate API depends of how many matches are being highlighted.

The Elasticsearch v5 split

In Elasticsearch < v5, there's a certain set of percolate APIs available, while in Elasticsearch >= v5, there's a different set of APIs available.

Internally within these percolate functions we detect your Elasticsearch version, then use the appropriate APIs

References

https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-percolate-query.html

Examples

## Not run: 
x <- connect(errors = "complete")

##### Elasticsearch < v5
if (x$es_ver() < 500) {
# typical usage
## create an index first
if (index_exists(x, "myindex")) index_delete(x, "myindex")
mapping <- '{
  "mappings": {
    "mytype": {
      "properties": {
        "message": {
           "type": "text"
        },
        "query": {
           "type": "percolator"
        }
      }
    }
  }
}'
index_create(x, "myindex", body = mapping)

## register a percolator
perc_body = '{
 "query" : {
    "match" : {
      "message" : "bonsai tree"
    }
 }
}'
percolate_register(x, index = "myindex", type = "mytype", 
  id = 1, body = perc_body)

## register another
perc_body2 <- '{
  "query" : {
    "match" : {
      "message" : "jane doe"
    }
  }
}'
percolate_register(x, index = "myindex", type = "mytype", 
  id = 2, body = perc_body2)

## match a document to a percolator
doc <- '{
 "query": {
   "percolate": {
     "field": "query",
     "document": {
       "message" : "A new bonsai tree in the office"
     }
   }
 }
}'
percolate_match(x, index = "myindex", type = "mytype", body = doc)

## List percolators - for an index, no type, can't do across indices
percolate_list(x, index = "myindex")$hits$hits

## Percolate counter
percolate_count(x, index = "myindex", type = "mytype", body = doc)$total

## delete a percolator
percolate_delete(x, index = "myindex", id = 2)
} # end ES < 5


##### Elasticsearch >= v5
if (x$es_ver() >= 500 && x$es_ver() <= 700) {
if (index_exists(x, "myindex")) index_delete(x, "myindex")

body <- '{
  "mappings": {
    "mytype": {
      "properties": {
        "message": {
           "type": "text"
        },
        "query": {
           "type": "percolator"
        }
      }
    }
  }
}'

# create the index with mapping
index_create(x, "myindex", body = body)

## register a percolator
z <- '{
  "query" : {
     "match" : {
       "message" : "bonsai tree"
     }
  }
}'
percolate_register(x, index = "myindex", type = "mytype", id = 1, body = z)

## register another
x2 <- '{
  "query" : {
    "match" : {
      "message" : "the office"
    }
  }
}'
percolate_register(x, index = "myindex", type = "mytype", id = 2, body = x2)

## match a document to a percolator
query <- '{
  "query" : {
    "percolate" : {
      "field": "query",
      "document": {
        "message": "A new bonsai tree in the office"
      }
    }
  }
}'
percolate_match(x, index = "myindex", body = query)
} # end ES >= 5




##### Elasticsearch >= v7
if (x$es_ver() >= 700) {
if (index_exists(x, "myindex")) index_delete(x, "myindex")

body <- '{
  "mappings": {
    "properties": {
      "message": {
        "type": "text"
      },
      "query": {
        "type": "percolator"
      }
    }
  }
}'

# create the index with mapping
index_create(x, "myindex", body = body)

## register a percolator
z <- '{
  "query" : {
     "match" : {
       "message" : "bonsai tree"
     }
  }
}'
percolate_register(x, index = "myindex", id = 1, body = z)

## register another
x2 <- '{
  "query" : {
    "match" : {
      "message" : "the office"
    }
  }
}'
percolate_register(x, index = "myindex", id = 2, body = x2)

## match a document to a percolator
query <- '{
  "query" : {
    "percolate" : {
      "field": "query",
      "document": {
        "message": "A new bonsai tree in the office"
      }
    }
  }
}'
percolate_match(x, index = "myindex", body = query)
} # end ES >= 7



## End(Not run)

ropensci/elastic documentation built on June 6, 2023, 8:41 p.m.