### Virtual environment

Follow the instructions to create and activate a [virtual environment](virtual-environments.md){.internal-link target=_blank} for the internal code of `fastapi`.

### Install requirements using pip

After activating the environment, install the required packages:

<div class="termy">

```console

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
else
    JAVACMD=java
    if ! command -v java >/dev/null 2>&1
    then
        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
fi

import org.opensearch.common.settings.Settings;
import org.opensearch.env.Environment;
import org.opensearch.index.IndexSettings;
import org.opensearch.index.analysis.AbstractCharFilterFactory;

public class IterationMarkCharFilterFactory extends AbstractCharFilterFactory {

    public IterationMarkCharFilterFactory(final IndexSettings indexSettings, final Environment env, final String name,
            final Settings settings) {

        RenderDataUtil.register(data, "bugReportItems", getBugReportItems());
    }

    /**
     * Gets a list of environment variables as key-value pairs.
     *
     * @return list of environment variable items
     */
    public static List<Map<String, String>> getEnvItems() {
        final List<Map<String, String>> itemList = new ArrayList<>();

            }
        } catch (NullPointerException e) {
            // Expected in test environment due to missing dependencies
            assertTrue("Test environment limitation", true);
        }
    }

    public void test_getLanguages_withAllLanguages() {
        SearchRequestParams params = createMockSearchRequestParams();

```console
$ source .venv/Scripts/activate
```

</div>

////

이 명령어는 이후에 실행될 명령어에서 사용될 [환경 변수](environment-variables.md){.internal-link target=_blank} 몇 개를 생성하거나 수정합니다.

이 변수들 중 하나가 바로 `PATH` 변수입니다.

/// tip | 팁

`PATH` 환경 변수에 대해 더 알고 싶다면 [환경 변수 문서의 PATH 환경 변수 섹션](environment-variables.md#path-environment-variable){.internal-link target=_blank}을 참고하세요.

///

import org.apache.lucene.analysis.ja.dict.UserDictionary;
import org.apache.lucene.analysis.util.CSVUtil;
import org.opensearch.OpenSearchException;
import org.opensearch.common.settings.Settings;
import org.opensearch.env.Environment;
import org.opensearch.index.IndexSettings;
import org.opensearch.index.analysis.AbstractTokenizerFactory;
import org.opensearch.index.analysis.Analysis;

        try {
            suggestJob.executeSuggestCreator();
            // In test environment, exception handling may vary
        } catch (JobProcessingException e) {
            assertTrue(e.getMessage().contains("SuggestCreator Process terminated"));
        } catch (Exception e) {
            // May throw different exception in test environment
            assertNotNull(e);
        }
    }

import org.opensearch.env.Environment;
import org.opensearch.index.IndexSettings;
import org.opensearch.index.analysis.AbstractCharFilterFactory;

public class ProlongedSoundMarkCharFilterFactory extends AbstractCharFilterFactory {
    private char replacement;

    public ProlongedSoundMarkCharFilterFactory(final IndexSettings indexSettings, final Environment env, final String name,
            final Settings settings) {

        }
    }

    /**
     * Get the environment map.
     * @return The environment map.
     */
    protected Map<String, String> getEnvMap() {
        if (envMap != null) {
            return envMap;
        }
        return System.getenv();
    }

    /**
     * Set the environment map.
     * @param envMap The environment map.
     */