fetch_batches: Fetch batches of records
In maia-sh/pubmedparser: Fetch and Parse PubMed Records

Batch IDs to account for Eutils server limits

fetch_batches(
  esearch,
  fetch_start = 1,
  fetch_end = NULL,
  batch_size = 10000,
  sleep_time = 0.2,
  dir = here::here(),
  file_name = esearch$QueryTranslation,
  quiet = FALSE,
  save_each_batch = TRUE,
  save_all_batches = FALSE
)

`esearch`	Esearch object. Generally the output of `search_get_pmids` or `check_update_esearch`.
`fetch_start`	Record fetch should start with. Default to 1.
`fetch_end`	Record fetch should end with. Defaults to NULL and dynamically set to max of esearch query. @param batch_size Maximum batch size. Defaults to 10000, which is eutilities' limit. @param sleep_time Sleep between queries to respect server limits. Defaults to 0.2 seconds. @param dir Directory for saving files. Default to project root (`here::here()`)
`file_name`	Root for file names. Default to esearch query.
`quiet`	Whether to silence messages in console. Defaults to FALSE.
`save_each_batch`	Whether each batch should be saved as raw characters to file. Defaults to TRUE.
`save_all_batches`	Whether all batches should be saved as vector of raw characters to file and nodeset. Defaults to FALSE (NOTE: This parameter is in development and should be set to FALSE.)

## Not run: 
# Run search and don't save any output
records_search <- search_get_pmids(term = "aquilegia[TITLE]",
                                   dir = NULL, output = NULL)
batch <- fetch_batches(records_search)

## End(Not run)