Elasticsearch throws the warning one argument not used by format '{"%s":{"_index":"%s"}}' when inserting data with docs_bulk_index() (and possibly other related functions). Despite that, the data seems to get inserted correctly.

Elasticsearch versions tested:

• 7.17.3
• 7.6.1

elastic package versions tested:

• 1.2.0 (CRAN)
• 1.2.1.91 (latest github version at the time of writing)

Steps to reproduce:

con <- elastic::connect("127.0.0.1")

dd <- data.frame(
  level = 400L,
  stringsAsFactors = FALSE)

elastic::docs_bulk_index(
  con,
  x = dd,
  index = "test_index",
  quiet = TRUE
)