fix/disable-vertex-search

[hui-zheng]

SUMMARY

this PR fixes a bug when apply terraform with vertex_serach disabled.

PROBLEM

When run terraform plan/apply with the following vars to disable Vertex_search

vertex_search = {
  enabled      = false
  ...
}

an error is thrown

│ Error: Invalid function argument
│
│   on main.tf line 69, in module "function":
│   69:   config = templatefile("${path.module}/slack-bot.yaml", merge({
│   70:     slack_token   = var.slack_token
│   71:     slack_app_id  = var.slack_app_id
│   72:     vertex_region = var.vertex_region
│   73:     vertex_model  = var.vertex_search.enabled == false ? var.vertex_model : var.vertex_model_multimodal
│   74:     api_enabled   = false
│   75:     }, var.vertex_search.enabled == true ? {
│   76:     api_enabled            = true
│   77:     vertex_search_function = module.api[""].run_service.url
│   78:   } : {}))
│     ├────────────────
│     │ while calling templatefile(path, vars)
│     │ module.api is object with no attributes
│     │ var.slack_app_id is "AxxxU"
│     │ var.slack_token is "xxxxXy"
│     │ var.vertex_model is "gemini-1.5-pro-preview-0409"
│     │ var.vertex_model_multimodal is "gemini-1.5-pro-preview-0409"
│     │ var.vertex_region is "uxxxl1"
│     │ var.vertex_search.enabled is false
│
│ Invalid value for "vars" parameter: vars map does not contain key "vertex_search_function", referenced at ./slack-bot.yaml:138,19-41.
╵

the issue is shown in the last line

vars map does not contain key "vertex_search_function", referenced at ./slack-bot.yaml:138,19-41.

FIX

add a default vertex_search_function value in terraform main

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[rosmo]

LGTM